{{short description|County in Virginia, United States}} {{Redirect|Loudoun County|the county in Tennessee|Loudon County, Tennessee}} {{Use American English|date=June 2025}} {{Use mdy dates|date=April 2024}} {{Infobox U.S. county | county = Loudoun County | state = Virginia | type = County | seal = Seal of Loudoun County, Virginia.svg | seal size = 87px |logo=100px|class=skin-invert | flag = Flag of Loudoun County, Virginia.svg | flag size = 110px | founded = 1757 | seat wl = Leesburg | named for = John Campbell, 4th Earl of Loudoun<ref name="Loudoun_History">{{cite web |url=http://loudoun.gov/index.aspx?nid=174 |title=About Loudoun - History |publisher=Loudoun County |access-date=January 3, 2013}}</ref> | largest city wl = Leesburg | city type = town | motto = "I Byde My Time"<ref name="PastFuture">Rosalind S. Helderman, [https://www.washingtonpost.com/wp-dyn/articles/A3513-2005Apr20.html Proud Past, Bright Future Rub Elbows in Today's Loudoun], ''Washington Post'' (April 21, 2005), page LZ03.</ref> | area_total_sq_mi = 521.33 | area_land_sq_mi = 515.74 | area_water_sq_mi = 5.6 | area percentage = 1.1 | population_as_of = 2020 | population_total = 420959 | pop_est_as_of = 2025 | population_est = 449749 {{increase}} | population_density_sq_mi = 810 | website = {{URL|https://www.loudoun.gov/|loudoun.gov}} | ex image = Loudoun County, Virginia Courthouse.jpg{{!}}border | ex image cap = Loudoun County Courthouse and a World War II monument (right) in Leesburg, February 2021 | ex image size = 280px | time zone = Eastern | district = 10th }}
'''Loudoun County''' ({{IPAc-en|ˈ|l|aʊ|d|ən}}) is in the northern part of the Commonwealth of Virginia in the United States. In 2020, the census returned a population of 420,959,<ref name="USCensusEst2019">{{cite web |url=https://www2.census.gov/programs-surveys/popest/tables/2010-2019/counties/totals/ |title=Population and Housing Unit Estimates |access-date=March 26, 2020}}</ref> making it Virginia's third-most populous county. The county seat is Leesburg.<ref name="GR6">{{cite web |url=http://www.naco.org/Counties/Pages/FindACounty.aspx |access-date=June 7, 2011 |title=Find a County |publisher=National Association of Counties |url-status=dead |archive-url=https://web.archive.org/web/20110531210815/http://www.naco.org/Counties/Pages/FindACounty.aspx |archive-date=May 31, 2011}}</ref> Loudoun County is part of the Washington–Arlington–Alexandria, DC–VA–MD–WV Metropolitan Statistical Area.
As of 2023, Loudoun County had a median household income of $156,821,<ref name=":2">{{Cite web |title=USDA ERS - Download the Data |url=http://www.ers.usda.gov/data-products/atlas-of-rural-and-small-town-america/download-the-data |access-date=2024-07-28 |website=www.ers.usda.gov}}</ref> the highest of any county or county equivalent in the nation.<ref>{{Cite web |title=U.S. Census Bureau QuickFacts: Loudoun County, Virginia |url=https://www.census.gov/quickfacts/fact/table/loudouncountyvirginia/PST045221 |access-date= |website=www.census.gov |language=en}}</ref> __TOC__
==History== ===18th century=== [[File:William and Sarah Nettle House Waterford Loudoun County Virginia.jpg|thumb|William and Sarah Nettle House in Waterford]] Loudoun County was established in 1757 from Fairfax County. The county is named for John Campbell, Fourth Earl of Loudoun and governor general of Virginia from 1756 to 1759.<ref name="Loudoun_History"/> Western settlement began in the 1720s and 1730s with English and Welsh Quakers, Scots-Irish, Germans and others moving south from Pennsylvania and Maryland, and also by English and enslaved Africans moving upriver from Tidewater.<ref>{{Cite web |title=History {{!}} Loudoun County, VA - Official Website |url=https://www.loudoun.gov/174/History#:~:text=Settling%20of%20the%20Loudoun%20area,and%20established%20large%20tobacco%20plantations. |access-date=August 2, 2022 |website=www.loudoun.gov}}</ref>
At the time of the American Revolution, Loudoun County was Virginia's most populous county. It was also rich in agriculture, and the county's contributions of grain to George Washington's Continental Army earned it the nickname "Breadbasket of the Revolution."<ref name="Loudoun Museum">{{cite web |title=Loudoun History |url=http://www.loudounmuseum.org/loudoun-history/ |publisher=Loudoun_Museum |access-date=March 22, 2014 |archive-url=https://web.archive.org/web/20140324004622/http://www.loudounmuseum.org/loudoun-history/ |archive-date=March 24, 2014 |url-status=dead}}</ref>
===19th century=== ====War of 1812==== During the War of 1812, important federal documents and government archives were evacuated from Washington and stored at Leesburg.<ref>{{cite web |url=https://www.achp.gov/preserve-america/community/leesburg-virginia |title=Leesburg Virginia |publisher=ADVISORY COUNCIL ON HISTORIC PRESERVATION}}</ref> Local tradition holds that these documents were stored at Rokeby House.<ref>{{Cite web |title=Rokeby House Becomes Nation's Capital |url=http://www.connectionnewspapers.com/news/2008/jul/22/rokeby-house-becomes-nations-capital/ |access-date=August 7, 2020 |website=Connection Newspapers |date=July 22, 2008}}</ref>
U.S. president James Monroe treated Oak Hill Plantation as a primary residence from 1823 until his death on July 4, 1831.<ref>[http://www.histarch.illinois.edu/highland/ashlawn5.html An Account of James Monroe's Land Holdings], by Christopher Fennell. Chapter V. Oak Hill Plantation, Loudoun County. Accessed November 18, 2016.</ref> The Loudoun County coat of arms and flag, granted by the English College of Arms, memorialize the special relationship between Britain and the United States that developed through his Monroe Doctrine.<ref>{{Cite web |title=County Flag {{!}} Loudoun County, VA - Official Website |url=https://www.loudoun.gov/178/County-Flag |access-date=August 2, 2022 |website=www.loudoun.gov}}</ref>
====American Civil War==== {{Main|Loudoun County in the American Civil War}}
The American Civil War divided the county, which saw fighting because of its strategic location. In April 1861, both of Loudoun County's representatives to the Virginia Secession Convention of 1861 favored the Union. Delegates elected John Janney, a former Quaker and slave owner, presided over that assembly, which ultimately voted to secede. Loudoun voters also voted to secede. In addition to Confederate cavalry and infantry units formed within the county, other Loudoun residents traveled to Maryland to join Union army cavalry and border guard units. On October 21, 1861, in the Battle of Ball's Bluff along the Potomac River near Leesburg, future jurist Oliver Wendell Holmes Jr. was critically wounded.
In the spring of 1862, Leesburg was occupied by Union troops and later recaptured by the Confederate Army after Union troops withdrew. Confederate partisan John S. Mosby based his operations in Loudoun and adjoining Fauquier County.<ref>{{Cite web |title=Loudoun County Burning Raid and John S. Mosby {{!}} History of Loudoun County, Virginia |url=https://www.loudounhistory.org/history/loudoun-cw-mosby-burning-raid/ |access-date=August 2, 2022 |language=en-US}}</ref>
In June 1863, during the Gettysburg campaign, Confederate major general J.E.B. Stuart and Union cavalry clashed in the battles of Aldie, Middleburg, and Upperville. By December 1863, Loudoun was held by Union forces, and was among the nine counties which elected delegates to the Virginia General Assembly at Alexandria.
Loudoun voters elected and reelected John J. Henshaw and J. Madison Downey<ref>{{Cite web|url=https://old.lva.virginia.gov/public/dvb/bio.asp?b=Downey_James_Madison|title=Dictionary of Virginia Biography - James Madison Downey (12 December 1809-28 March 1884) Biography|website=old.lva.virginia.gov}}</ref> as their representatives to that body, and fellow delegates elected Downey as their Speaker. Loudoun voters elected and reelected William F. Mercer to the upper body of that version of the Virginia General Assembly, and elected him to the Virginia Senate in the 1865–1867 session. They elected former delegates R.M. Bentley and William Hill Gray as their part-time delegates in the lower house in that session.<ref>Cynthia Miller Leonard, The Virginia General Assembly 1619-1978 (Richmond: Virginia State Library 1978) pp. 495-497, 501, 503</ref>
===20th century=== During World War I, Loudoun County was a major breadbasket for supplying provisions to soldiers in Europe. Loudoun farmers implemented new agricultural innovations such as vaccination of livestock, seed inoculations and ensilage. The county experienced a boom in agricultural output, outputting an annual wheat output of 1.04 million bushels in 1917, the largest of any county in Virginia that year. 1.2 million units of home produce were produced at home, much of which went to training sites across the state such as Camp Lee. The Smith–Lever Act of 1914 established increased agricultural education in Virginia counties, increasing agricultural yields. After the war, a plaque was dedicated to the "30 glorious dead" from the county who died in the Great War. Five of the thirty died on the front, while the other twenty five died while in training or in other locations inside the United States.<ref>{{cite book |last1=Rainville |first1=Lynn |title=Virginia and the Great War : mobilization, supply and combat, 1914-1919 |date=February 12, 2018 |publisher=McFarland & Company, inc., Publishers |location=Jefferson, North Carolina |isbn=978-1-4766-7192-5 |pages=60}}</ref>
In 1962, Dulles International Airport was built in southeastern Loudoun County in Sterling. Since then, Loudoun County has experienced a high-tech boom and rapid growth. Accordingly, many have moved to eastern Loudoun and become residents of planned communities such as Sterling Park, Sugarland Run, Cascades, Ashburn Village, and Ashburn Farm, making that section a veritable part of the Washington suburbs. Others have moved to the county seat or to the small towns and rural communities of the Loudoun Valley, which makes up the majority of the county's area.<ref name="Loudoun Museum"/>
==Geography== {{Location map+ | Massies Corner to Mount Airy | caption = Map of Loudoun County in Virginia | width= 400 | places =
{{Location map~ | Massies Corner to Mount Airy | label =Harpers{{nbsp}}Ferry{{nbsp}}National{{nbsp}}Historical{{nbsp}}Park | label_size=100 | marksize=5 | position =bottom | lat_deg =39.322778 | lon_deg =-77.729722 }} {{Location map~ | Massies Corner to Mount Airy | label =Montgomery | label_size=100 | marksize=0 | position =left | lat_deg =38.98 | lon_deg =-77.15 | outside = 1 <!-- Turn off error category due to location outside map--> }} {{Location map~ | Massies Corner to Mount Airy | label =Arlington | label_size=100 | marksize=0 | position =left | lat_deg =38.87 | lon_deg =-77.15 | outside = 1 <!-- Turn off error category due to location outside map--> }} {{Location map~ | Massies Corner to Mount Airy | label =Fairfax | label_size=100 | marksize=5 | position =left | lat_deg =38.87 | lon_deg =-77.304377 }} {{Location map~ | Massies Corner to Mount Airy | label =Washington | label_size=100 | marksize=0 | position =top | lat_deg =39.34 | lon_deg =-77.723342 }} {{Location map~ | Massies Corner to Mount Airy | label =Frederick | label_size=100 | marksize=0 | position =right | lat_deg =39.34 | lon_deg =-77.548994 }} {{Location map~ | Massies Corner to Mount Airy | label =Jefferson | label_size=100 | marksize=0 | position =left | lat_deg =39.31 | lon_deg =-77.86 }} {{Location map~ | Massies Corner to Mount Airy | label =Clarke | label_size=100 | marksize=0 | position =right | lat_deg =39.05 | lon_deg =-78 }} {{Location map~ | Massies Corner to Mount Airy | label =Fauquier | label_size=100 | marksize=0 | position =left | lat_deg =38.74 | lon_deg =-77.81 }} {{Location map~ | Massies Corner to Mount Airy | label =Fairfax{{nbsp}}County | label_size=100 | marksize=0 | position =left | lat_deg =38.8 | lon_deg =-77.4 }} {{Location map~ | Massies Corner to Mount Airy | label =Loudoun | label_size=100 | marksize=0 | position =top | lat_deg =39.2 | lon_deg =-77.6 }} {{Location map~ | Massies Corner to Mount Airy | label =Manassas | label_size=100 | marksize=5 | position =right | lat_deg =38.751415 | lon_deg =-77.47 }} {{Location map~ | Massies Corner to Mount Airy | label =Manassas{{nbsp}}Park | label_size=100 | marksize=5 | position =left | lat_deg =38.773564 | lon_deg =-77.46 }} {{Location map~ | Massies Corner to Mount Airy | label =Prince{{nbsp}}William | label_size=100 | marksize=0 | position =left | lat_deg =38.7 | lon_deg =-77.48 }} }}
According to the U.S. Census Bureau, Loudoun County has a total area of {{convert|521|sqmi|km2}}, of which {{convert|516|sqmi|km2}} is land and {{convert|6|sqmi|km2}} (1.1%) is water.<ref name="GR1">{{cite web |url=https://www.census.gov/geographies/reference-files/time-series/geo/gazetteer-files.html |publisher=United States Census Bureau |access-date=April 23, 2011 |date=February 12, 2011 |title=US Gazetteer files: 2010, 2000, and 1990}}</ref> It is bounded on the north by the Potomac River; across the river are Frederick, Washington and Montgomery counties in Maryland; it is bounded on the south by Prince William and Fauquier counties, on the west by the watershed of the Blue Ridge Mountain across which are Jefferson County, West Virginia and Clarke County, and on the east by Fairfax County. The Bull Run Mountains and Catoctin Mountain bisect the county. To the west of the range is the Loudoun Valley. Bisecting the Loudoun Valley from Hillsboro to the Potomac River is Short Hill Mountain.
===Adjacent counties=== {| |- style="vertical-align:top;" | * Fairfax County (east) * Prince William County (southeast) * Fauquier County (south) * Jefferson County, West Virginia (west) | * Clarke County (west) * Washington County, Maryland (northwest) * Frederick County, Maryland (north) * Montgomery County, Maryland (east) |}
===National protected area=== * Harpers Ferry National Historical Park
==Demographics== {{US Census population |1790= 18962 |1800= 20523 |1810= 21338 |1820= 22702 |1830= 21939 |1840= 20431 |1850= 22079 |1860= 21774 |1870= 20929 |1880= 23634 |1890= 23274 |1900= 21948 |1910= 21167 |1920= 20577 |1930= 19852 |1940= 20291 |1950= 21147 |1960= 24549 |1970= 37150 |1980= 57427 |1990= 86129 |2000= 169599 |2010= 312311 |2020= 420959 |estyear=2025 |estimate=449749 |estref=<ref name="USCensusEst2025">{{cite web|url=https://www.census.gov/data/tables/time-series/demo/popest/2020s-counties-total.html|title=County Population Totals and Components of Change: 2020-2025|publisher=United States Census Bureau|access-date=April 17, 2026}}</ref> {{increase}} |align-fn=center |footnote=U.S. Decennial Census<ref name="DecennialCensus">{{cite web |url=https://www.census.gov/prod/www/decennial.html |title=Census of Population and Housing from 1790 |publisher=US Census Bureau |access-date=January 24, 2022}}</ref><br />1790-1960<ref>{{cite web |url=http://mapserver.lib.virginia.edu |title=Historical Census Browser |publisher=University of Virginia Library |access-date=January 2, 2014}}</ref> 1900-1990<ref>{{cite web |url=https://www.census.gov/population/cencounts/va190090.txt |title=Population of Counties by Decennial Census: 1900 to 1990 |publisher=United States Census Bureau |access-date=January 2, 2014}}</ref><br />1990-2000<ref>{{cite web |url=https://www.census.gov/population/www/cen2000/briefs/phc-t4/tables/tab02.pdf |archive-url=https://ghostarchive.org/archive/20221009/https://www.census.gov/population/www/cen2000/briefs/phc-t4/tables/tab02.pdf |archive-date=October 9, 2022 |url-status=live |title=Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000 |publisher=United States Census Bureau |access-date=January 2, 2014}}</ref> 2010<ref name=2010CensusP2/> 2020<ref name=2020CensusP2/> | align = right }}
From 1890 to 1940, the county had a decline in population as people moved to cities for more opportunities.{{citation needed|date=May 2017}} The decline was likely highest among African Americans, who had worked in an agricultural economy that was becoming increasingly mechanized.{{citation needed|date=May 2017}} During the first half of the 20th century, African Americans moved out of rural areas to cities in the Great Migration.{{citation needed|date=May 2017}} In the 21st century, African Americans now form a proportionally much smaller portion of the county's population than they once did, and the Hispanic and Asian populations of the county outnumber them significantly.
===2020 census=== As of the 2020 census, the county had a population of 420,959. The median age was 37.0 years. 28.1% of residents were under the age of 18 and 9.9% of residents were 65 years of age or older. For every 100 females there were 96.9 males, and for every 100 females age 18 and over there were 94.3 males age 18 and over.<ref name="Census2020DP">{{cite web|title=2020 Decennial Census Demographic Profile (DP1)|url=https://api.census.gov/data/2020/dec/dp?get=NAME,DP1_0021P,DP1_0024P,DP1_0025C,DP1_0049C,DP1_0045C,DP1_0069C,DP1_0073C,DP1_0125P,DP1_0126P,DP1_0129P,DP1_0138P,DP1_0139P,DP1_0141P,DP1_0142P,DP1_0143P,DP1_0145P,DP1_0146P,DP1_0147C,DP1_0148C,DP1_0149C,DP1_0156C,DP1_0157C,DP1_0158C,DP1_0159P,DP1_0160P&for=county%3A107&in=state%3A51|website=United States Census Bureau|year=2021|access-date=December 24, 2025|df=mdy}}</ref><ref name="Census2020PL">{{cite web|title=2020 Decennial Census Redistricting Data (Public Law 94-171)|url=https://api.census.gov/data/2020/dec/pl?get=NAME,P1_001N,P1_003N,P1_004N,P1_005N,P1_006N,P1_007N,P1_008N,P1_009N,P2_001N,P2_002N,H1_001N,H1_002N&for=county%3A107&in=state%3A51|website=United States Census Bureau|year=2021|access-date=December 24, 2025|df=mdy}}</ref>
The racial makeup of the county was 53.7% White, 7.3% Black or African American, 0.4% American Indian and Alaska Native, 21.3% Asian, 0.1% Native Hawaiian and Pacific Islander, 6.7% from some other race, and 10.6% from two or more races. Hispanic or Latino residents of any race comprised 14.2% of the population.<ref name="Census2020PL"/>
88.1% of residents lived in urban areas, while 11.9% lived in rural areas.<ref name="Census2020DHC">{{cite web|title=2020 Decennial Census Demographic and Housing Characteristics (DHC)|url=https://api.census.gov/data/2020/dec/dhc?get=NAME,P2_002N,P2_003N&for=county%3A107&in=state%3A51|website=United States Census Bureau|year=2023|access-date=December 24, 2025|df=mdy}}</ref>
There were 137,442 households in the county, of which 46.2% had children under the age of 18 living with them and 18.4% had a female householder with no spouse or partner present. About 16.8% of all households were made up of individuals and 5.8% had someone living alone who was 65 years of age or older.<ref name="Census2020DP"/>
There were 142,074 housing units, of which 3.3% were vacant. Among occupied housing units, 76.4% were owner-occupied and 23.6% were renter-occupied. The homeowner vacancy rate was 0.7% and the rental vacancy rate was 5.6%.<ref name="Census2020DP"/>
===Racial and ethnic composition=== {| class="wikitable" style="text-align:center;" |+'''Loudoun County, Virginia – Racial and ethnic composition'''<br><small>{{nobold|''Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race.''}}</small> !Race / Ethnicity <small>(''NH = Non-Hispanic'')</small> !Pop 1980<ref name=1980Census>{{Cite web|title=1980 Census of Population - General Social and Economic Characteristics - Virginia - Table 15 - Persons by Race: 1980 and Table 16 - Total Persons and Spanish Origin Persons by Type of Spanish Origin and Race: 1980 |url=https://www2.census.gov/prod2/decennial/documents/1980/1980censusofpopu80148uns_bw.pdf|website=United States Census Bureau|page=13-24|via=WayBack Machine|archive-url=https://web.archive.org/web/20260218082208/https://www2.census.gov/prod2/decennial/documents/1980/1980censusofpopu80148uns_bw.pdf| archive-date=February 18, 2026}}</ref> !Pop 1990<ref>{{Cite web |title=1990 Census of Population - General Population Characteristics - Virginia: Tables 3-6 - Race and Hispanic Origin |website=United States Census Bureau|url=https://www2.census.gov/library/publications/decennial/1990/cp-1/cp-1-48.pdf|access-date=|page=13-51|via=WayBack Machine|archive-url=https://web.archive.org/web/20210624191618/https://www2.census.gov/library/publications/decennial/1990/cp-1/cp-1-48.pdf| archive-date=June 24, 2021}}</ref> !Pop 2000<ref name=2000CensusP004>{{Cite web|title=P004: Hispanic or Latino, and Not Hispanic or Latino by Race – 2000: DEC Summary File 1 – Loudon County, Virginia|url=https://data.census.gov/table?g=0500000US51107&tid=DECENNIALSF12000.P004|website=United States Census Bureau |access-date= }}</ref> !Pop 2010<ref name=2010CensusP2>{{Cite web |title=P2 Hispanic or Latino, and Not Hispanic or Latino by Race – 2010: DEC Redistricting Data (PL 94-171) - Loudoun County, Virginia |url=https://data.census.gov/cedsci/table?q=p2&g=0500000US51107&tid=DECENNIALPL2010.P2 |website=United States Census Bureau}}</ref> !{{partial|Pop 2020}}<ref name=2020CensusP2>{{Cite web |title=P2 Hispanic or Latino, and Not Hispanic or Latino by Race – 2020: DEC Redistricting Data (PL 94-171) - Loudoun County, Virginia |url=https://data.census.gov/cedsci/table?q=p2&g=0500000US51107&tid=DECENNIALPL2020.P2 |website=United States Census Bureau}}</ref> !% 1980 !% 1990 !% 2000 !% 2010 !{{partial|% 2020}} |- |White alone (NH) |50,876 |75,557 |134,972 |194,845 |style='background: #ffffe6; |216,865 |{{Percentage|50876|57,427|2}} |87.73% |{{Percentage|134972|169599|2}} |62.39% |style='background: #ffffe6; |51.52% |- |Black or African American alone (NH) |4,964 |6,126 |11,517 |21,934 |style='background: #ffffe6; |29,725 |{{Percentage|4964|57,427|2}} |7.11% |{{Percentage|11517|169599|2}} |7.02% |style='background: #ffffe6; |7.06% |- |Native American or Alaska Native alone (NH) |94{{efn|Includes all people who gave "American Indian", "Eskimo", or "Aleut" as their race, regardless of Hispanic identity.}} |167 |297 |520 |style='background: #ffffe6; |536 |{{Percentage|94|57,427|2}} |0.19% |{{Percentage|297|169599|2}} |0.17% |style='background: #ffffe6; |0.13% |- |Asian alone (NH) |424{{efn|Includes all people who gave "Japanese", "Chinese", "Filipino", "Korean", "Asian Indian", or "Vietnamese" as their race, regardless of Hispanic identity.}} |2,053 |9,025 |45,795 |style='background: #ffffe6; |89,372 |{{Percentage|424|57,427|2}} |2.38% |{{Percentage|9025|169599|2}} |14.66% |style='background: #ffffe6; |21.23% |- |Pacific Islander alone (NH) |6{{efn|Includes all people who gave "Hawaiian", "Guamanian", or "Samoan" as their race, regardless of Hispanic identity.}} |N/A |93 |143 |style='background: #ffffe6; |227 |{{Percentage|6|57,427|2}} |N/A |{{Percentage|93|169599|2}} |0.05% |style='background: #ffffe6; |0.05% |- |Some Other Race alone (NH) |210 |70 |367 |808 |style='background: #ffffe6; |2,425 |0.37% |0.08% |{{Percentage|367|169599|2}} |0.26% |style='background: #ffffe6; |0.58% |- |Mixed Race or Multi-Racial (NH) |N/A |N/A |3,239 |9,690 |style='background: #ffffe6; |22,065 |N/A |N/A |{{Percentage|3239|169599|2}} |3.10% |style='background: #ffffe6; |5.24% |- |Hispanic or Latino (any race) |853 |2,156 |10,089 |38,576 |style='background: #ffffe6; |59,744 |{{Percentage|853|57,427|2}} |2.50% |{{Percentage|10089|169599|2}} |12.35% |style='background: #ffffe6; |14.19% |- |'''Total''' |'''57,427''' |'''86,129''' |'''169,599''' |'''312,311''' |style='background: #ffffe6; |'''420,959''' |'''100.00%''' |'''100.00%''' |'''100.00%''' |'''100.00%''' |style='background: #ffffe6; |'''100.00%''' |}
===2000 to 2019=== As of the census of 2010,<ref name="GR8">{{cite web |url=https://www.census.gov |publisher=United States Census Bureau |access-date=May 14, 2011 |title=U.S. Census website}}</ref> there were 312,311 people, 104,583 households, and 80,494 families residing in the county. The population density was {{convert|606|PD/sqmi|PD/km2|sp=us|adj=off}}. There were 109,442 housing units at an average density of {{convert|212|/sqmi|/km2|sp=us|adj=off}}. The racial makeup of the county was: * 68.7% White * 14.7% Asian (7.90% Indian, 1.74% Filipino, 1.61% Chinese, 1.34% Korean, 1.22% Vietnamese, 1.09% Pakistani) * 7.3% African American * 0.3% Native American * 0.1% Pacific Islander * 4.9% of some other race * 4.0% of two or more races * 12.4% of the population were Hispanic or Latino of any race (3.4% Salvadoran, 1.8% Mexican, 1.3% Peruvian, 0.9% Puerto Rican, 0.6% Honduran, 0.6% Bolivian, 0.5% Guatemalan, 0.5% Colombian)
According to the 2010 census, 10.5% of residents reported being of German ancestry, while 9.1% reported Irish, 7.7% English, 5.4% Italian and 5.2% American ancestry.
The most spoken languages other than English in Loudoun County in 2018 were Spanish, spoken by 10.8% of the population, and Telugu, spoken by 2.8% of the population.<ref>{{Cite web |title=Loudoun County, VA {{!}} Data USA |url=https://datausa.io/profile/geo/loudoun-county-va#:~:text=The%20most%20common%20foreign%20languages,and%20Hindi%20(8,491%20speakers). |access-date=April 4, 2021 |website=datausa.io |language=en}}</ref>{{Citation needed|reason=''This information is not verifiable using the source provided''|date=March 2025}} Almost 25% of Loudoun County residents were born outside of the United States, with the largest number of foreign-born residents being from El Salvador, India, and Mexico.<ref>{{Cite web |title=Loudoun County, VA {{!}} Data USA |url=https://datausa.io/profile/geo/loudoun-county-va#:~:text=The%20most%20common%20foreign%20languages,and%20Hindi%20(8,491%20speakers). |access-date=March 27, 2025 |website=datausa.io |language=en}}</ref>
As of 2000, there were 59,900 households, out of which 43.10% had children under the age of 18 living with them, 64.30% were married couples living together, 7.80% had a female householder with no husband present, and 24.80% were non-families. 18.40% of all households were made up of individuals, and 3.70% had someone living alone who was 65 years of age or older. The average household size was 2.82, and the average family size was 3.24.
In the county, 29.80% of the population was under the age of 18, 5.70% was from 18 to 24, 38.90% from 25 to 44, 20.00% from 45 to 64, and 5.60% was 65 years of age or older. The median age was 34 years. For every 100 females, there were 97.80 males. For every 100 females age 18 and over, there were 95.50 males.
In 2011, census survey data concluded that Loudoun County had the highest median income in the country at $119,134.<ref name=acs2011>{{cite web |title=LOUDOUN COUNTY INCOME HIGHLIGHTS, AMERICAN COMMUNITY SURVEY, 2011 ACS UPDATE |url=http://www.loudoun.gov/DocumentCenter/Home/View/9701 |publisher=Loudoun County Department of Planning |access-date=March 26, 2014}}</ref>
From 1980 to 2014, deaths from cancer in Loudoun County decreased by 46 percent, the largest such decrease of any county in the United States.<ref>Barry-Jester, Anna Maria. "[https://web.archive.org/web/20161217120652/http://fivethirtyeight.com/features/how-americans-die-may-depend-on-where-they-live/?ex_cid=story-twitter How Americans Die May Depend On Where They Live]". ''FiveThirtyEight''. December 13, 2016.</ref>
From 2017 to 2018, Loudoun County saw an increase of 18.5% of households experiencing homelessness, a 21% increase for single adults, and a 36% increase for families. Homelessness for veterans in the county decreased by 16% from 2017 to 2018.<ref>{{Cite news |url=https://www.loudountimes.com/news/on-the-brink-homelessness-on-the-rise-in-loudoun-county/article_cf8bb372-5f80-11e8-81ff-2ba9d1196016.html |title=On the brink: Homelessness on the rise in Loudoun County |last=Baratko |first=Trevor |date=May 25, 2018 |work=LoudounTimes.com |access-date=May 25, 2018 |language=en}}</ref>
==Economy== thumb|An aerial view of Loudoun County south of Ashburn. Several large data centers are visible in the foreground of this photograph. Traditionally a rural county, Loudoun's population has grown dramatically since the 1980s. Having undergone heavy suburbanization since 1990, Loudoun has a full-fledged service economy. It is home to world headquarters for several Internet-related and high tech companies, including Verizon Business, Telos Corporation, and Orbital Sciences Corporation. Like Fairfax County's Dulles Corridor, Loudoun County has economically benefited from Dulles International Airport, the majority of which is in the county along its border with Fairfax.<ref>{{Cite news |url=https://biz.loudoun.gov/2017/09/13/loudoun-domestic-tourism-worth-nearly-1-7-billion/ |title=Loudoun Domestic Tourism Worth Nearly $1.7 Billion - Loudoun County Economic Development, VA |date=September 13, 2017 |work=Loudoun County Economic Development, VA |access-date=June 4, 2018 |language=en-US}}</ref><ref>{{Cite news |url=https://biz.loudoun.gov/2018/02/26/another-record-year-dulles-international-airport/ |title=Another Record Year at Dulles International Airport - Loudoun County Economic Development, VA |date=February 26, 2018 |work=Loudoun County Economic Development, VA |access-date=June 4, 2018 |language=en-US}}</ref>{{citation needed|date=May 2017}}
Loudoun County retains a strong rural economy. The equine industry has an estimated revenue of $78 million. It is home to the Morven Park International Equestrian Center which hosts national horse trials. In addition, a growing wine industry has produced several internationally recognized wines. Loudoun County now has 40 wineries<ref>{{cite web |url=http://www.visitloudoun.org/Experience-Loudoun/Wine-Country/Wineries-Tasting-Rooms |title=Loudon Is DC's Wine Country |publisher=Loudoun Convention and Visitors Association (Visit Loudoun) |url-status=dead |archive-url=https://web.archive.org/web/20130529011525/http://www.visitloudoun.org/Experience-Loudoun/Wine-Country/Wineries-Tasting-Rooms |archive-date=May 29, 2013}}</ref> and over 25 active farms. Loudoun has rich soil and was in the mid-19th century a top wheat-producing county in the fourth largest wheat-producing state.<ref>{{cite web |url=http://www.loudounhistory.org/history/agriculture-mills-and-wheat.htm |title=Early 19th-Century Milling and Wheat Farming |work=The History of Loudoun County, Virginia |quote=Since its settlement in the mid-1700s, Loudoun County has been acclaimed for its fertile soil. In the 1850s and 1860s, Virginia was the fourth largest wheat producing state, and Loudoun was one of the state's top-producing counties.}}</ref>
MCI, Inc. (formerly WorldCom), a subsidiary of Verizon Communications, is headquartered in Ashburn, Loudoun County. It announced it would move its headquarters to Ashburn in 2003.<ref name="HQInfo">{{cite web |url=http://www.secinfo.com/dr8Pp.25j.htm |title=Schedule 13D. Amendment to General Statement of Beneficial Ownership |author=MCI Inc |publisher=Securities and Exchange Commission |date=March 14, 2003 |access-date=September 25, 2009}}</ref><ref>{{cite news |url=http://edition.cnn.com/2003/BUSINESS/04/14/worldcom/ |title=WorldCom to emerge from collapse |work=CNN |edition=international |date=April 14, 2003 |access-date=September 25, 2009}}</ref> AOL had its headquarters at 22000 AOL Way in Dulles in unincorporated Loudoun County.<ref>{{cite web |url=http://corp.aol.com/about-aol/company-overview |title=Company Overview |publisher=AOL |date=February 8, 2008 |access-date=May 7, 2009 |url-status=dead |archive-url=https://web.archive.org/web/20090218213649/http://corp.aol.com/about-aol/company-overview |archive-date=February 18, 2009}}</ref> In 2007 AOL announced it would move its headquarters from Loudoun County to New York City; it would continue to operate its Virginia offices.<ref name="GoldfarbHQMove">{{cite news |last=Goldfarb |first=Zachary |author2=Diaz, Sam |url=https://www.washingtonpost.com/wp-dyn/content/article/2007/09/17/AR2007091700415.html |newspaper=The Washington Post |title=AOL Moving Executives, Headquarters to New York |date=September 18, 2007 |page=A01 |access-date=May 7, 2009}}</ref> Orbital Sciences Corporation has its headquarters in Dulles.<ref>{{cite web |url=http://www.orbital.com/About/Contact/ |title=Contact Information |publisher=Orbital Sciences Corporation |access-date=September 25, 2009}}</ref>
Loudoun County houses over 60 massive data centers, many of which correspond to Amazon Web Services's (AWS) us-east-1 region.<ref>{{Cite web |url=https://datacenterfrontier.com/amazon-plans-epic-data-center-expansion-in-northern-virginia/ |title=Amazon Plans Epic Data Center Expansion in Northern Virginia |date=November 6, 2017 |website=Data Center Frontier |language=en-US |access-date=February 14, 2019}}</ref><ref>{{Cite web |title=Regions and Zones |url=https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html |access-date=July 8, 2022 |website=AWS Documentation}}</ref> It has been claimed that these data centers carry 70 percent of daily global web traffic,<ref>{{Cite web |url=https://washingtonian.com/2016/09/14/70-percent-worlds-web-traffic-flows-loudoun-county/ |title=70 Percent of the World's Web Traffic Flows Through Loudoun County {{!}} Washingtonian (DC) |date=September 14, 2016 |website=Washingtonian |language=en-US |access-date=February 14, 2019}}</ref> although this figure has been disputed with a more conservative estimate of 22 percent.<ref>{{Cite web | url=https://cardinalnews.org/2025/07/29/the-famous-claim-that-70-of-the-worlds-internet-traffic-goes-through-northern-virginia-is-wrong/ | title=The famous claim that 70% of the world’s internet traffic goes through Northern Virginia is wrong |date=July 29, 2025 |website=Cardinal News |language=en-US |access-date=December 22, 2025}}</ref> Loudoun County's "Data Center Alley" is the world's largest concentration of data centers with over 25 million square feet of data centers.<ref>{{Cite web |title=Data Centers |url=https://biz.loudoun.gov/key-business-sectors/data-centers/ |access-date=May 16, 2025 |website=AWS Documentation}}</ref>
Before its dissolution, Independence Air (originally Atlantic Coast Airlines) was headquartered in Dulles.<ref>{{cite web |url=http://www.atlanticcoast.com/company__information.shtm |archive-url=https://archive.today/20010811200720/http://www.atlanticcoast.com/company__information.shtm |url-status=dead |archive-date=August 11, 2001 |title=Company Information |publisher=Atlantic Coast Airlines |date=August 11, 2001 |access-date=September 25, 2009}}</ref><ref>{{cite magazine |url=http://investing.businessweek.com/research/stocks/private/snapshot.asp?privcapId=4220709 |archive-url=https://web.archive.org/web/20120924142856/http://investing.businessweek.com/research/stocks/private/snapshot.asp?privcapId=4220709 |url-status=dead |archive-date=September 24, 2012 |title=Independence Air, Inc. |magazine=Bloomberg Businessweek |access-date=September 25, 2009}}</ref> At one time Atlantic Coast Airlines had its headquarters in Sterling.<ref>{{citation |title=SKEEN, K. B. |journal=Standard & Poor's Register of Corporations, Directors and Executives |volume=2 |publisher=Standard & Poor's Corp. |year=1998 |url=https://books.google.com/books?id=xtdIAAAAYAAJ&q=%22Atlantic+Coast+Airlines%22+%22Sterling,+VA%22 |page=1012 |access-date=January 31, 2011 |quote=Atlantic Coast Airlines Inc., One Export Dr., Sterling, VA 20164}}</ref> Before its dissolution, MAXjet Airways was headquartered on the grounds of Dulles International Airport.<ref>{{cite web |url=http://www.maxjet.com/contactUsAction.do |archive-url=https://web.archive.org/web/20060718083041/http://www.maxjet.com/contactUsAction.do |url-status=dead |archive-date=July 18, 2006 |title=Contact Us |publisher=MAXjet Airways |date=February 18, 2007 |access-date=September 25, 2009}}</ref>
===Top employers=== According to the county's annual comprehensive financial reports, the top employers in the county are:<ref>{{Cite web |title=Loudoun County Annual Comprehensive Financial Report - Year Ended June 30, 2024 |url=https://www.loudoun.gov/DocumentCenter/View/211930/FY2024-Loudoun-ACFR |access-date=2 November 2025 |website=Loudoun County, Virginia Government Website}}</ref>
{| class="wikitable sortable" border="1" |- ! # ! Employer ! # of employees (2024) !Percentage of Total County Employment |- |1 |Loudoun County Public Schools |12,968 |6.79 |- |2 |County of Loudoun |4,813 |2.48 |- |3 |U.S. Department of Homeland Security |2,500-5,000 |1.99 |- |4 |Inova Health System (Loudoun Hospital Center) |2,500-5,000 |1.99 |- |5 |United Airlines |2,500-5,000 |1.99 |- |6 |Amazon |1,000-2,500 |0.93 |- |7 |Northrop Grumman (formerly Orbital ATK) |1,000-2,500 |0.93 |- |8 |Verizon Business (formerly MCI Worldcom) |1,000-2,500 |0.93 |- |9 |RTX (formerly Raytheon Technologies) |1,000-2,500 |0.93 |- |10 |Walmart |1,000-2,500 |0.93 |}
==Government and politics==
[[File:Backroads in Loudoun County.jpg|thumb|Many Loudoun County historical structures pre-date the American Civil War]] Between 1952 and 2008, Loudoun was a Republican-leaning county.
However, this has changed in recent years with Democrats winning Loudoun in all statewide campaigns after Republicans narrowly carried it in 2014. As of the 2025 elections, Democrats hold a seven to two majority on the Board of Supervisors and a five to four majority on the School Board, but Republicans hold all five countywide elected constitutional offices (Clerk of the Circuit Court, Commissioner of the Revenue, Commonwealth's Attorney, Sheriff, and Treasurer). This makes Loudoun County a reliable state bellwether, having voted for every statewide presidential election winner since 1932.
The county's official motto, ''I Byde My Time'', is borrowed from the coat of arms of the Earl of Loudoun.<ref name="PastFuture" /><ref>[https://www.loudoun.gov/index.aspx?NID=177 Coat of Arms], Loudoun County.</ref> In the mid to late 20th century, as northerners gradually migrated to Southern suburbs, Loudoun County increasingly shifted to the Republican Party in supporting presidential candidates, and more local ones. Before the 2008 election of Barack Obama, county voters had not supported a Democratic president since Lyndon B. Johnson in 1964.
In recent years, the county's rapid suburban growth in its eastern portion, settled by educated professionals working in or near Washington, D.C., has changed the demographics of the county, and the Democratic Party has become increasingly competitive. After giving Senator Barack Obama nearly 54% of its presidential vote in 2008, the county supported Republican Bob McDonnell in 2009, who received 61% of the gubernatorial vote. Voters also replaced two incumbent Democratic delegates, making Loudoun's state House delegation all Republican. In 2012 county voters again supported Obama, who took 51.5% of the vote, with Republican challenger Mitt Romney garnering 47%.<ref>{{cite web |url=http://results.elections.virginia.gov/vaelections/2016+November+General/Site/Locality/LOUDOUN+COUNTY/President+and+Vice+President.html |archive-url=https://web.archive.org/web/20121111134156/http://results.elections.virginia.gov/vaelections/2016%20November%20General/Site/Locality/LOUDOUN%20COUNTY/President%20and%20Vice%20President.html |url-status=dead |archive-date=November 11, 2012 |date=November 11, 2012 |access-date=August 7, 2018 |title=2016 November General}}</ref> Democrats have won the county in every presidential election since 2008.
In 2020, Joe Biden won 61.5% of the county's vote, the best result for a Democratic candidate in Loudoun since 1964.<ref>{{cite web |title=President and Vice President |website=Election Results Virginia.Gov |url=http://electionresults.virginia.gov/ResultsExport.aspx?rid=3545232527424045364&osn=0&pty=&name=President+and+Vice+President&cat=CTY |archive-url=https://web.archive.org/web/20121111134156/http://electionresults.virginia.gov/ResultsExport.aspx?rid=3545232527424045364&osn=0&pty=&name=President%20and%20Vice%20President&cat=CTY |url-status=dead |archive-date=November 11, 2012 |date=November 11, 2012 |access-date=August 7, 2018 |quote=Spreadsheet download }}</ref> A year later, in the 2021 Virginia gubernatorial election, Democratic nominee and former Governor Terry McAuliffe won the county with 55.3% to Glenn Youngkin's 44.2%.<ref>{{Cite web |title=2021 November General |url=https://results.elections.virginia.gov/vaelections/2021%20November%20General/Site/Locality/LOUDOUN_COUNTY/Governor.html |access-date=June 16, 2022 |website=results.elections.virginia.gov}}</ref> Loudoun was one of ten counties that was won by McAuliffe, though it was his smallest margin of victory in Northern Virginia.<ref>{{Cite web |title=2021 Virginia governor election results {{!}} CNN Politics |url=https://www.cnn.com/election/2021/results/virginia/governor |access-date=June 16, 2022 |website=CNN |language=en}}</ref> In 2024, Kamala Harris won 56% to Donald Trump's 40%, with the county shifting right by 9 percentage points from 2020 to 2024.<ref>{{Cite web |title=Election Results |url=https://enr.elections.virginia.gov/results/public/loudoun-county/elections/2024NovemberGeneral |access-date=2025-04-22 |website=enr.elections.virginia.gov}}</ref>
{{PresHead|place=Loudoun County, Virginia|source=<ref>{{cite web |url=http://uselectionatlas.org/RESULTS |title=Dave Leip's Atlas of U.S. Presidential Elections |first=David |last=Leip |website=Uselectionatlas.org |access-date=August 7, 2018}}</ref><ref>{{Cite news|url=https://historical.elections.virginia.gov/elections/view/80871/ |archive-url=https://web.archive.org/web/20250803232949/https://historical.elections.virginia.gov/elections/view/80871/ |archive-date=2025-08-03 |url-status=live|title=2016 President General Election|last=O'Bannon|first=John|author-link=John O'Bannon|date=November 8, 2016|work=Virginia Department of Elections|access-date=October 13, 2025}}</ref>}} <!-- PresRow should be {{PresRow|Year|Winning party|GOP vote #|Dem vote #|3rd party vote #|State}} --> {{PresRow|1880|Democratic|1,792|2,780|0|Virginia}} {{PresRow|1884|Democratic|1,978|2,795|26|Virginia}} {{PresRow|1888|Democratic|2,190|2,842|58|Virginia}} {{PresRow|1892|Democratic|1,738|2,719|200|Virginia}} {{PresRow|1896|Democratic|1,991|2,741|105|Virginia}} {{PresRow|1900|Democratic|1,684|2,690|125|Virginia}} {{PresRow|1904|Democratic|442|1,558|72|Virginia}} {{PresRow|1908|Democratic|447|1,570|75|Virginia}} {{PresRow|1912|Democratic|256|1,386|126|Virginia}} {{PresRow|1916|Democratic|404|1,490|28|Virginia}} {{PresRow|1920|Democratic|757|1,720|29|Virginia}} {{PresRow|1924|Democratic|152|1,794|85|Virginia}} {{PresRow|1928|Democratic|1,325|1,915|4|Virginia}} {{PresRow|1932|Democratic|600|2,440|31|Virginia}} {{PresRow|1936|Democratic|867|2,287|8|Virginia}} {{PresRow|1940|Democratic|1,061|2,156|14|Virginia}} {{PresRow|1944|Democratic|1,485|1,802|7|Virginia}} {{PresRow|1948|Democratic|1,430|1,545|270|Virginia}} {{PresRow|1952|Republican|2,540|2,075|15|Virginia}} {{PresRow|1956|Republican|2,489|1,960|211|Virginia}} {{PresRow|1960|Republican|2,526|2,399|29|Virginia}} {{PresRow|1964|Democratic|2,594|4,278|5|Virginia}} {{PresRow|1968|Republican|4,577|3,262|2,131|Virginia}} {{PresRow|1972|Republican|9,417|3,941|199|Virginia}} {{PresRow|1976|Republican|9,192|7,995|561|Virginia}} {{PresRow|1980|Republican|12,076|6,694|1,722|Virginia}} {{PresRow|1984|Republican|17,765|8,227|136|Virginia}} {{PresRow|1988|Republican|20,448|10,101|313|Virginia}} {{PresRow|1992|Republican|19,290|14,462|7,822|Virginia}} {{PresRow|1996|Republican|25,715|19,942|3,673|Virginia}} {{PresRow|2000|Republican|42,453|30,938|2,262|Virginia}} {{PresRow|2004|Republican|60,382|47,271|777|Virginia}} {{PresRow|2008|Democratic|63,336|74,845|1,278|Virginia}} {{PresRow|2012|Democratic|75,292|82,479|2,289|Virginia}} {{PresRow|2016|Democratic|69,949|100,795|12,353|Virginia}} {{PresRow|2020|Democratic|82,088|138,372|4,402|Virginia}} {{PresRow|2024|Democratic|92,107|129,280|8,305|Virginia}} {{PresFoot}}
===County Board of Supervisors=== Like many counties in Virginia, Loudoun is locally governed by a board of supervisors, the Loudoun County Board of Supervisors. The chairman of the board is elected by county voters at-large while the remaining supervisors are elected from eight single-member districts roughly equal in population. All nine members serve concurrent terms of four years. The board handles policy and land use issues and sets the budget; it appoints a county administrator to handle the county government's day-to-day operations.<ref>{{Cite web |url=https://www.loudoun.gov/DocumentCenter/View/117084 |title=Loudoun County Board of Supervisors Operations Manual |website=Loudoun.gov |archive-url=https://web.archive.org/web/20160713213035/https://www.loudoun.gov/DocumentCenter/View/117084 |archive-date=July 13, 2016 |url-status=dead |access-date=August 7, 2018}}</ref> As of the 2023 elections, the chairman of the board and six district supervisors are Democrats; the remaining two supervisors are Republicans.
The Board's current Chair, Phyllis Randall, became the first person of color in Virginia's history to be an elected chair of a county board when she was elected Chair-at-Large in 2015.<ref>{{Cite web |last=Culver • • |first=David |date=2015-11-04 |title=Loudoun County Elects First African-Americans to Board of Supervisors |url=https://www.nbcwashington.com/news/local/loudoun-county-elects-first-african-americans-to-board-of-supervisors/2072078/ |access-date=2025-03-26 |website=NBC4 Washington |language=en-US}}</ref>
In November 2019, Democrats took over the Board of Supervisors. Voters elected Juli E. Briskman (D) in Algonkian District, with 6,763 votes (54.09%) replacing incumbent Suzanne M. Volpe (R) who polled 5,719 votes (45.74%). Juli Briskman had been fired from her job as a marketing analyst for a United States government and military subcontractor, after an AFP photo of her flipping off the motorcade of Donald Trump went viral on social media in 2017.<ref>{{cite news |url=https://www.cbsnews.com/news/woman-who-flipped-off-trump-juli-briskman-cyclist-finger-president-motorcade-wins-virginia-election-loudoun-county/ |title=Woman who was fired for flipping off Trump wins election in Virginia |work=CBS News |date=November 7, 2019}}</ref>
{| class=wikitable |+Loudoun County Board of Supervisors (January 1, 2024, to December 31, 2027)<br>(Elected on November 7, 2023)<ref name=":0">{{Cite web |date=November 8, 2023 |title=LIVE COVERAGE: Election night in Loudoun County |url=https://www.loudountimes.com/news/live-coverage-election-night-in-loudoun-county/article_bb9ff23a-7d91-11ee-a29d-ff543f352ca9.html |access-date=November 8, 2023 |website=Loudoun Times-Mirror |language=en}}</ref> |- ! colspan=2 align=center valign=bottom | Position ! style="text-align:center;" | Name ! valign=bottom | Party ! valign=bottom align=center | First Elected ! valign=bottom align=center | District |- | style="background-color:{{party color|Democratic Party (United States)}}" | | Chair | Phyllis Randall | style="text-align:center;" | Democratic | style="text-align:center;" | 2015 | style="text-align:center;" | At-Large |- | style="background-color:{{party color|Democratic Party (United States)}}" | | Vice Chair | Mike Turner | style="text-align:center;" | Democratic | style="text-align:center;" | 2019 | style="text-align:center;" | Ashburn |- | style="background-color:{{party color|Democratic Party (United States)}}" | | Supervisor | Juli Briskman | style="text-align:center;" | Democratic | style="text-align:center;" | 2019 | style="text-align:center;" | Algonkian |- | style="background-color:{{party color|Democratic Party (United States)}}" | | Supervisor | Sylvia Glass | style="text-align:center;" | Democratic | style="text-align:center;" | 2019 | style="text-align:center;" | Broad Run |- | style="background-color:{{party color|Republican Party (United States)}}" | | Supervisor | Caleb Kershner | style="text-align:center;" | Republican | style="text-align:center;" | 2019 | style="text-align:center;" | Catoctin |- | style="background-color:{{party color|Republican Party (United States)}}" | | Supervisor | Matt Letourneau | style="text-align:center;" | Republican | style="text-align:center;" | 2011 | style="text-align:center;" | Dulles |- | style="background-color:{{party color|Democratic Party (United States)}}" | | Supervisor | Kristen Umstattd | style="text-align:center;" | Democratic | style="text-align:center;" | 2015 | style="text-align:center;" | Leesburg |- | style="background-color:{{party color|Democratic Party (United States)}}" | | Supervisor | Laura TeKrony | style="text-align:center;" | Democratic | style="text-align:center;" | 2023 | style="text-align:center;" | Little River |- | style="background-color:{{party color|Democratic Party (United States)}}" | | Supervisor | Koran Saines | style="text-align:center;" | Democratic | style="text-align:center;" | 2015 | style="text-align:center;" | Sterling |- |}
{| class=wikitable |+Constitutional Officers (January 1, 2024, to December 31, 2027)<br/>(Elected on November 7, 2023)<ref name=":0" /> |- ! colspan=2 align=center valign=bottom | Position ! style="text-align:center;" | Name ! valign=bottom | Party ! valign=bottom align=center | First Election |- | style="background-color:{{party color|Republican Party (United States)}}" | | Clerk of the Circuit Court | Gary M. Clemens | style="text-align:center;" | Republican | style="text-align:center;" | 1999 |- | style="background-color:{{party color|Republican Party (United States)}}" | |Commissioner of the Revenue |Robert S. Wertz Jr. | style="text-align:center;" | Republican | style="text-align:center;" | 2003 |- | style="background-color:{{party color|Republican Party (United States)}}" | | Commonwealth's Attorney | Robert D. Anderson | style="text-align:center;" | Republican | style="text-align:center;" | 2023 |- | style="background-color:{{party color|Republican Party (United States)}}" | | Sheriff | Michael L. Chapman | style="text-align:center;" | Republican | style="text-align:center;" | 2011 |- | style="background-color:{{party color|Republican Party (United States)}}" | |Treasurer |Henry C. Eickelberg | style="text-align:center;" | Republican | style="text-align:center;" | 2023 |}
{| class="wikitable" |+Loudoun County School Board (January 1, 2026, to December 31, 2027)<br/>(Elected on November 7, 2023 and November 4, 2025)<ref name=":0" /><ref name=":3">{{Cite web |last=Styer |first=Patrick Lewis, William Timme, Hanna Pampaloni and Norman K. |date=2025-11-04 |title=Spanberger Wins Governorship, Democrats Sweep House Races |url=https://www.loudounnow.com/news/spanberger-wins-governorship-democrats-sweep-house-races/article_4b393b74-2ae3-4247-99d6-ee97267f4850.html |access-date=2026-01-15 |website=LoudounNow.com |language=en}}</ref> |- ! colspan="2" align="center" valign="bottom" | Position ! style="text-align:center;" | Name ! valign="bottom" | Party ! valign="bottom" align="center" | First Elected ! valign="bottom" align="center" | District |- | style="background-color:{{party color|Democratic Party (United States)}}" | | Chair | April Chandler | style="text-align:center;" | Nonpartisan | style="text-align:center;" | 2023 | style="text-align:center;" | Algonkian |- | style="background-color:{{party color|Democratic Party (United States)}}" | |Vice Chair |Anne Donohue | style="text-align:center;" | Nonpartisan | style="text-align:center;" | 2023 | style="text-align:center;" | At-Large |- | style="background-color:{{party color|Republican Party (United States)}}" | | Member | Deana Griffiths | style="text-align:center;" | Nonpartisan | style="text-align:center;" | 2023 | style="text-align:center;" | Ashburn |- | style="background-color:{{party color|Democratic Party (United States)}}" | | Member |Ross Svenson | style="text-align:center;" | Nonpartisan | style="text-align:center;" | 2025 | style="text-align:center;" | Broad Run |- | style="background-color:{{party color|Republican Party (United States)}}" | | Member |Kari LaBell | style="text-align:center;" | Nonpartisan | style="text-align:center;" | 2023 | style="text-align:center;" | Catoctin |- | style="background-color:{{party color|Democratic Party (United States)}}" | | Member | Jon Pepper | style="text-align:center;" | Nonpartisan | style="text-align:center;" | 2025 | style="text-align:center;" | Dulles |- | style="background-color:{{party color|Independent Party (United States)}}" | | Member |Lauren Shernoff | style="text-align:center;" | Nonpartisan | style="text-align:center;" | 2023 | style="text-align:center;" | Leesburg |- | style="background-color:{{party color|Democratic Party (United States)}}" | | Member | Sumera Rashid | style="text-align:center;" | Nonpartisan | style="text-align:center;" | 2023 | style="text-align:center;" | Little River |- | style="background-color:{{party color|Republican Party (United States)}}" | | Member | Amy Riccardi | style="text-align:center;" | Nonpartisan | style="text-align:center;" | 2025 | style="text-align:center;" | Sterling |- |}
{| class=wikitable |+Virginia General Assembly Senators<br/>(Elected on November 7, 2023)<ref name=":0" /><ref name=":4">{{Cite web |title=Loudoun County January 7, 2025 Special Election Results |url=https://www.loudoun.gov/ArchiveCenter/ViewFile/Item/14321}}</ref> |- ! colspan=2 align=center valign=bottom | Position ! style="text-align:center;" | Name ! valign=bottom | Party ! valign=bottom align=center | First Elected ! valign=bottom align=center | District |- | style="background-color:{{party color|Democratic Party (United States)}}" | | Senator | Russet Perry | style="text-align:center;" | Democratic | style="text-align:center;" | 2023 | style="text-align:center;" | 31 |- | style="background-color:{{party color|Democratic Party (United States)}}" | | Senator | Kannan Srinivasan | style="text-align:center;" | Democratic | style="text-align:center;" | 2025 (Special) | style="text-align:center;" | 32 |}
{| class=wikitable |+Virginia General Assembly Delegates<br/>(Elected on November 4, 2025)<ref name=":3" /><ref name=":4" /> |- ! colspan=2 align=center valign=bottom | Position ! style="text-align:center;" | Name ! valign=bottom | Party ! valign=bottom align=center | First Elected ! valign=bottom align=center | District |- | style="background-color:{{party color|Democratic Party (United States)}}" | | Delegate | JJ Singh | style="text-align:center;" | Democratic | style="text-align:center;" | 2025 (Special) | style="text-align:center;" | 26 |- | style="background-color:{{party color|Democratic Party (United States)}}" | | Delegate | Atoosa Reaser | style="text-align:center;" | Democratic | style="text-align:center;" | 2023 | style="text-align:center;" | 27 |- | style="background-color:{{party color|Democratic Party (United States)}}" | | Delegate | David Reid | style="text-align:center;" | Democratic | style="text-align:center;" | 2017 | style="text-align:center;" | 28 |- | style="background-color:{{party color|Democratic Party (United States)}}" | | Delegate | Marty Martinez | style="text-align:center;" | Democratic | style="text-align:center;" | 2023 | style="text-align:center;" | 29 |- | style="background-color:{{party color|Democratic Party (United States)}}" | | Delegate | John McAuliff | style="text-align:center;" | Democratic | style="text-align:center;" | 2025 | style="text-align:center;" | 30 |}
The National Transportation Safety Board operates the Ashburn Aviation Field Office in Ashburn, an unincorporated area of Loudoun County.<ref>"[https://www.ntsb.gov/abt_ntsb/regions/aviation.htm Regional Offices: Aviation]." National Transportation Safety Board. Retrieved on May 15, 2010.</ref> The Federal Aviation Administration's Washington Air Route Traffic Control Center, the second-busiest facility of its kind in the nation, is located in Leesburg.<ref>{{Cite web|url=https://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/air_traffic_services/artcc|title=FAA ARTCCs}}</ref>
Emergency services are provided by the Loudoun County Combined Fire and Rescue System with the Office of Emergency Management. LC-CFRS is a combination system that utilizes some 500 volunteers and over 600 career firefighters, EMT/paramedics, dispatchers, and support staff. LCFR is one of the largest fire and rescue systems in Virginia.<ref>{{Cite web |title=Fire & Rescue {{!}} Loudoun County, VA - Official Website |url=https://www.loudoun.gov/4116/Fire-Rescue |access-date=December 1, 2021 |website=www.loudoun.gov}}</ref>
Law enforcement in Loudoun County is provided by the Loudoun County Sheriff's Office, which is Virginia's largest sheriff's office, as well as three town police departments: Leesburg Police, Purcellville Police, and Middleburg Police. The county's highways are also patrolled by Virginia State Police troopers. Dulles Airport and the Dulles Toll Road are patrolled by the Metropolitan Washington Airports Authority Police Department.<ref>{{Cite web |title=MWAA Police Department |url=https://www.mwaa.com/policefireems/mwaa-police-department |access-date=December 1, 2021 |website=mwaa.com |language=en}}</ref><ref>{{Cite web|url=https://www.loudoun.gov/BusinessDirectoryII.aspx?lngBusinessCategoryID=25|title=Sign In - Authentication}}</ref><ref>{{Cite web|url=https://www.loudoun.gov/4120/Sheriffs-Office|title=Sheriff | Loudoun County, VA - Official Website|website=www.loudoun.gov}}</ref><ref>{{Cite web |title=BFO Division 7 {{!}} BCI Field Office Appomattox (7) - Virginia State Police |url=https://www.vsp.virginia.gov/Div7.shtm |access-date=December 1, 2021 |website=www.vsp.virginia.gov |language=en}}</ref>
The Loudoun County Public Library System has eleven<ref>{{Cite web |url=https://library.loudoun.gov/Locations-and-Hours |title=Locations and Hours |last=Library |first=Loudoun County Public |website=Library.loudoun.gov |language=en-US |access-date=June 4, 2018 |archive-url=https://web.archive.org/web/20180808012229/https://library.loudoun.gov/Locations-and-Hours |archive-date=August 8, 2018 |url-status=dead}}</ref> branches in the county. The library's Outreach Department of the Loudoun County Public Library is a resource for those who cannot easily access branch services. The public library system has won several awards, including 10th place for libraries serving a comparably sized population in 2006.<ref>[http://www.haplr-index.com/ Hennen's American Public Library Ratings] (HAPLR).</ref><ref>{{Cite web |title=Site Index |url=https://library.loudoun.gov/siteindex#about |access-date=December 1, 2021 |website=library.loudoun.gov}}</ref>
Loudoun County is one of the counties in Virginia that elects to cover their employees in the Virginia Mortgage Assistance Program (VMAP). The program is designed to make housing more affordable for civil service workers in Virginia.<ref>{{Cite web |title=Virginia Mortgage Assistance Program {{!}} VMAP - Official Website |url=https://brightleafmortgage.com/vmap/ |access-date=September 22, 2022 |website=www.brightleafmortgage.com}}</ref>
==Transportation== {{Main|Loudoun County Transit}}
===Airports=== [[File:Dulles International Airport (IAD), aerial 2024-08-22.jpg|thumb|Aerial view of Dulles International Airport in Dulles in August 2024]] Loudoun County has two airports: Dulles International and Leesburg Executive.
===Bus=== Loudoun County operates its own bus public transit system, known as Loudoun County Transit.
===Rail=== The Silver Line of the Washington Metro provides service at the Dulles Airport, Loudoun Gateway, and Ashburn stations.
===Major highways=== [[File:2019-09-03 13 11 06 View north along U.S. Route 15 and east along Virginia State Route 7 (Leesburg Bypass) from the overpass for Sycolin Road Southeast in Leesburg, Loudoun County, Virginia.jpg|thumb|US 15 and VA State Route 7 on the Leesburg Bypass in September 2019]] {| |- style="vertical-align:top;" | * 20px U.S. Route 15 (James Monroe Highway) * 20px U.S. Route 50 (Little River Turnpike) * 20px U.S. Route 340 * 20px State Route 7 (Leesburg Pike) * 20px State Route 9 (Charles Town Pike) | * 20px State Route 28 * 25px State Route 267 (Dulles Greenway) * 20px 20px Loudoun County Parkway * 20px 20px Braddock Road (Northern Virginia) |}
==Education== The county is served by Loudoun County Public Schools (LCPS). LCPS serves over 70,000 students from kindergarten through 12th grade and is Virginia's fifth largest school system.<ref>[http://cmsweb1.loudoun.k12.va.us/50975427144147/site/default.asp About Loudoun County Public Schools] {{webarchive|url=https://web.archive.org/web/20120209074756/http://cmsweb1.loudoun.k12.va.us/50975427144147/site/default.asp |date=February 9, 2012 }}, Loudoun County Public Schools</ref><ref>[http://www.doe.virginia.gov/VDOE/Publications/schcensus/2005/Census2005_sum.htm 2005 Triennial school census] {{webarchive|url=https://web.archive.org/web/20100111223027/http://www.doe.virginia.gov/VDOE/Publications/schcensus/2005/Census2005_sum.htm |date=January 11, 2010 }}, Virginia Department of Education</ref> Loudoun County schools recently ranked 11th in the United States in terms of educational achievement versus funds spent.<ref>{{cite magazine |url=https://www.forbes.com/2007/07/05/schools-taxes-education-biz-beltway_cz_cs_0705schools_2.html |archive-url=https://web.archive.org/web/20070708224329/http://www.forbes.com/2007/07/05/schools-taxes-education-biz-beltway_cz_cs_0705schools_2.html |url-status=dead |archive-date=July 8, 2007 |title=Best And Worst School Districts For The Buck |access-date=July 17, 2008 |magazine=Forbes |date=July 5, 2007 |first=Christina |last=Settimi}}</ref> Loudoun County also sends students to its Loudoun Academy of Science, formerly housed within Dominion High School now within the Academies of Loudoun,<ref name="Academy of Science">{{cite web |title=Loudoun County Academy of Science |url=http://lcps.org/aos |website=Loudoun County Public Schools |access-date=August 17, 2015 |archive-url=https://web.archive.org/web/20150819115745/http://lcps.org/aos |archive-date=August 19, 2015 |url-status=dead}}</ref> and is eligible to send students to Thomas Jefferson High School for Science and Technology, a STEM magnet school in Alexandria, Virginia.<ref>{{cite web |title=TJHSST Eligibility Requirements |url=https://www.fcps.edu/registration/thomas-jefferson-admissions/eligibility-requirements |publisher=Fairfax County Public Schools |access-date=April 19, 2017}}</ref>
Loudoun County is home to ten private schools: Loudoun Country Day School, a Pre-K–8 independent school in Leesburg; Notre Dame Academy, an independent non-denominational day high school in Middleburg; Evergreen Christian School, a private high school near Leesburg; the Foxcroft School, a boarding school for girls located in Middleburg; Dominion Academy, a Non-denominational Christian school, K–8 in Leesburg; Loudoun Classical School, a Protestant classical 7th-12th grade school in Purcellville;<ref>{{cite web |title=Loudoun Classical School |url=http://www.loudounclassicalschool.com |access-date=April 1, 2019}}</ref> St. Theresa School, a K–8 Roman Catholic school in Ashburn; Village Montessori School at Bluemont, an accredited Pre-K through Elementary Montessori school in Bluemont; Christian Faith & Fellowship School, a PreK–12 non-denominational Christian school and Loudoun County's only private school accredited by the Association of Christian Schools International;{{Citation needed|date=May 2008}} and Loudoun School for Advanced Studies (formerly the Ideal Schools High School,) an independent non-denominational school in Ashburn.{{citation needed|date=May 2017}}
In terms of post-secondary education, Loudoun County is home to a variety of colleges and universities, including: Patrick Henry College, a private Christian college; Northern Virginia Community College in Sterling (branch campus); George Washington University (satellite campus); George Mason University (satellite campus); Marymount University (satellite campus); Shenandoah University (satellite campus); and Strayer University (satellite campus).<ref>{{cite news |title=Loudoun Guide 2006: Higher Education at Your Fingertips |newspaper=The Washington Post |year=2006 |url=https://www.washingtonpost.com/wp-srv/metro/usersguides/loudoun/HighEd.html}}</ref> Loudoun is also home to a satellite campus of the Virginia–Maryland College of Veterinary Medicine and the Janelia Farm Research Campus of the Howard Hughes Medical Institute.{{citation needed|date=May 2017}}
==Communities==
===Towns=== {{div col|colwidth=20em}} * Hamilton * Hillsboro * Leesburg (county seat) * Lovettsville * Middleburg * Purcellville * Round Hill {{div col end}}
===Census-designated places=== {{div col|colwidth=18em}} * Aldie * Arcola * Ashburn * Belmont * Brambleton * Broadlands * Cascades * Countryside * Dulles Town Center * Goose Creek Village * Kincora * Lansdowne * Loudoun Valley Estates * Lowes Island * Moorefield * Oak Grove * One Loudoun * South Riding * Sterling * Stone Ridge * Sugarland Run * University Center * Waterford {{div col end}}
===Other unincorporated communities=== {{div col|colwidth=15em}} * Airmont * Bloomfield * Bluemont * Britain * Conklin * Dover * Dulles * Elvan * Eubanks * Georges Mill * Gilberts Corner * Gleedsville * Howardsville * Leithtown * Lenah * Lincoln * Loudoun Heights * Lucketts * Morrisonville * Mount Gilead * Neersville * Paeonian Springs * Paxson * Philomont * Potomac Falls * River Creek * Ryan * Saint Louis * Scattersville * Silcott Spring * Stewartown * Stumptown * Taylorstown * Telegraph Spring * Unison * Watson * Waxpool * Wheatland * Willard * Willisville * Woodburn {{div col end}}
===Population ranking=== The population ranking of the following table is based on 2018 estimates by the United States Census Bureau.<ref>{{Cite web |last=United States Census Bureau |title=Loudoun County, Virginia |url=https://data.census.gov/cedsci/profile?g=0500000US51107 |access-date=October 20, 2020 |website=data.census.gov}}</ref>
'''†''' ''county seat'' {| class="wikitable sortable" |+ !Rank !City/Town/etc. !Municipal type !Population (2018 est.) |- |1 |'''†''' Leesburg |Town |52,125 |- |2 |Ashburn |CDP |50,290 |- |3 |South Riding |CDP |31,071 |- |4 |Sterling |CDP |30,403 |- |5 |Brambleton |CDP |20,081 |- |6 |Broadlands |CDP |13,704 |- |7 |Stone Ridge |CDP |12,990 |- |8 |Lansdowne |CDP |12,696 |- |9 |Sugarland Run |CDP |12,576 |- |10 |Cascades |CDP |11,670 |- |11 |Lowes Island |CDP |11,111 |- |12 |Countryside |CDP |10,042 |- |13 |Purcellville |Town |9,709 |- |14 |Belmont |CDP |6,629 |- |15 |Dulles Town Center |CDP |5,023 |- |16 |University Center |CDP |4,060 |- |16 |Lovettsville |Town |2,544 |- |17 |Oak Grove |CDP |2,468 |- |18 |Moorefield Station |CDP |1,369 |- |19 |Arcola |CDP |963 |- |20 |Round Hill |Town |693 |- |21 |Middleburg |Town |620 |- |22 |Hamilton |Town |537 |- |23 |Hillsboro |Town |175 |}
==Notable people== {{more citations needed|section|date=May 2022}} James Monroe constructed and resided at Oak Hill near Aldie after his presidency. American Civil War Brigadier General Robert H. Chilton (Chief of Staff under Robert E. Lee) was a native of Loudoun County. World War II general George C. Marshall resided at Dodona Manor in Leesburg. Essayist and journalist Russell Baker grew up in Morrisonville, Virginia and his book ''Growing Up'' highlights his childhood in rural Virginia. Entertainer Arthur Godfrey lived near historic Waterford, Virginia. Loudoun County is also the birthplace of Julia Neale Jackson, mother of Stonewall Jackson,<ref>{{cite web |url=http://www.vmi.edu/content.aspx?id=5005 |title=Stonewall Jackson Ancestors |work=VMI Archives |publisher=Virginia Military Institute |quote=She was born 28 February 1798 near Aldie, Loudoun Co., VA.}}</ref> and Susan Catherine Koerner Wright, mother of the Wright Brothers.<ref>{{cite web |url=http://www.aopa.org/whatsnew/newsitems/2003/03-2-095x.html |title=Happy Mother's Day, Mrs. Wright |work=AOPA ONLINE |publisher=Aircraft Owners and Pilots Association |quote=Susan Catherine Koerner was born in tiny Hillsboro, Va.}}</ref> * Madeleine Albright (1937–2022) – U.S. Secretary of State in Clinton Administration * William H. Ash (1859–1908) – Former slave who was one of the first African-American politicians to be elected to the Virginia House of Delegates * Russell Baker (1925–2019) – Pulitzer Prize-winning author of ''Growing Up'' (1983, Autobiography)<ref>{{cite web |url=http://www.pulitzer.org/cyear/1983w.html |title=The Pulitzer Prizes |work=pulitzer.org}}</ref> * Geraldine Brooks (1955–) – Pulitzer Prize–winning author * John Champe – Revolutionary War soldier and double agent * Roger Preston Chew (1843–1921) – Horse artillery commander in the Confederate Army of Northern Virginia, prominent West Virginia businessman, railroad executive and West Virginia legislator<ref>Hermitage NRIS at p. 13, available at http://www.wvculture.org/shpo/nr/pdf/jefferson/93001444.pdf</ref> * John L. Dagg (1794–1884) – Baptist theologian, pastor, educator, and president of Mercer University, GA (1844–54)<ref>{{cite web |url=http://www.founders.org/library/dagg_sketch.html |archive-url=https://web.archive.org/web/19961104222741/http://founders.org/library/dagg_sketch.html |url-status=dead |archive-date=November 4, 1996 |title=Biographical Sketch of John L. Dagg |work=founders.org}}</ref><ref>[http://tarver.mercer.edu/archives/MercerPresidents/ "John Leadley Dagg 1844-1854 Mercer University Presidents"] {{webarchive|url=https://web.archive.org/web/20110322180904/http://tarver.mercer.edu/archives/MercerPresidents/ |date=March 22, 2011 }}</ref> * Westmoreland Davis (1859–1942) – Governor of Virginia * Richard Henry Dulany (1820–1906) – Colonel of the 7th Virginia Cavalry during the Civil War * Michael Farris (1951–) – Founder of the Home School Legal Defense Association and Patrick Henry College in Purcellville; unsuccessful Republican nominee for lieutenant governor of Virginia in 1993 * Joe Gibbs (1940–) – Lived just west of Leesburg while coaching the Washington Redskins * Arthur Godfrey (1903–1983) – Popular national radio and television personality * Darrell Green (1960–) – Former Washington Redskin and inductee to the NFL Pro Football Hall of Fame * Pamela Harriman (1920–1997) – Daughter-in-law of Sir Winston Churchill and U.S. ambassador to France * Gina Haspel (1956–) – Director of the CIA, first female ever appointed to the position * Annia Hatch (1978–) – Cuban American 2x Olympic silver medalist in gymnastics, currently lives in Ashburn * Fred Hetzel (1942–) – Former professional basketball player * Barbara Holland (1933–2010) – author * Tony Horwitz (1958–2019) – Pulitzer Prize–winning author * John Janney (1798–1872) – Member of the Virginia General Assembly and officer of the Virginia Secession Convention of 1861 * Sheila Johnson (1949–) – Entertainment and sports entrepreneur and philanthropist. * Wilton Lackaye (1862-1932) – American stage and film actor, the original Broadway stage Svengali, 1895 * Lyndon LaRouche (1921–2019) – Controversial American politician, activist, and founder of the LaRouche movement * Marc Leepson (1945–) – Journalist, historian, author * Sandra Lerner (c. 1953–) – Entrepreneur and philanthropist * Mark Levin (1957–) – Author and conservative talk radio host * George C. Marshall (1880–1959) – General of the Army (5-star), U.S. Secretary of State, Secretary of Defense, and author of the "Marshall Plan"<ref>{{Cite web |title=Dodona Manor |url=https://www.georgecmarshall.org/dodona-manor |access-date=August 2, 2022 |website=George C. Marshall |language=en-US}}</ref> * Stevens T. Mason (1811–1843) – First governor of Michigan (Democrat, 1837–40)<ref>{{cite web |url=http://www.biography.com/search/article.do?id=9401895 |archive-url=https://archive.today/20070930022305/http://www.biography.com/search/article.do?id=9401895 |url-status=dead |title=Stevens Thomson Mason Biography - Biography.com |date=September 30, 2007 |archive-date=September 30, 2007 |website=Archive.is |access-date=August 7, 2018}}</ref> * Andrew McCabe (1968–) – Former Deputy Director of the FBI * Charles F. Mercer (1788–1858) – Founded village of Aldie; U.S. Congressman from Virginia * Billy Mitchell (1879–1936) – Controversial Army officer and military aviation pioneer * James Monroe (1758–1831) – 5th President of the United States * Oliver North (1943–) – Former USMC Officer and figure in the Iran–Contra scandal; commentator and host on the Fox network * Patton Oswalt (1969–) – American stand-up comedian, writer and actor *Vinton Liddell Pickens (1900–1993) – artist, chair of the first Loudoun County planning commission in 1941 * Wilson Pickett (1941–2006) – R&B and soul singer and songwriter * Isaiah L. Potts (1784?–after 1843) – tavern keeper of the notorious Potts Tavern who, allegedly, ran a gang of highwaymen and murderers on the Illinois frontier * Rachel Renee Russell (1959–) – #1 ''New York Times'' best-selling author of the children's book series, Dork Diaries * Henry S. Taylor (1942–) – Pulitzer Prize-winning poet * Will Toledo (1992–) – lead singer of Car Seat Headrest, musician, songwriter * Joshua White (1812–1890) – businessman and Illinois state legislator * Lucien Whiting Powell (1846–1930) – Renowned landscape artist * William Wilson (1794–1857) – Chief Justice of the Supreme Court of Illinois<ref>{{cite web |url=http://www.illinoiscourts.gov/SupremeCourt/JusticeArchive/Bio_WWilson.asp |title=William Wilson - Previous Illinois Supreme Court Justice |website=Illinoiscourts.gov}}</ref>
==Sister cities== Loudoun County has eight Sister City/County relationships, and one Friendship City Partnership. Most are also suburbs of their respective capitals.<ref>{{Cite web |title=Sister Cities/Sister Counties {{!}} Loudoun County, VA - Official Website |url=https://www.loudoun.gov/3026/Sister-CitiesSister-Counties |access-date= |website=Loudoun.gov}}</ref>
* Canelones, Uruguay (2023)<ref name=":1">{{Cite web |last=Rizer |first=Buddy |date=February 21, 2023 |title=FINANCE/GOVERNMENT OPERATIONS AND ECONOMIC DEVELOPMENT REPORT: New Sister Cities Approval |url=https://loudoun.granicus.com/MetaViewer.php?view_id=88&clip_id=7191&meta_id=224549 |website=Loudoun.gov}}</ref> * Gangneung, South Korea (Friendship City, 2014)<ref>{{Cite web |last=York |first=Scott |date=July 2, 2014 |title=13. Board Member Initiative: Sister City Friendship Agreement with Gangneung City, Republic of Korea (York) |url=https://loudoun.granicus.com/GeneratedAgendaViewer.php?view_id=88&clip_id=3806 |access-date= |website=Loudoun.gov}}</ref> * Goyang, South Korea (2012)<ref>{{Cite web |last1=York |first1=Scott |last2=Clarke |first2=Janet |date=December 5, 2012 |title=24. *Board Member Initiative: Board Support to Form a Sister County Relationship/Partnership with Goyang City, Korea (York/Clarke) |url=https://loudoun.granicus.com/GeneratedAgendaViewer.php?view_id=88&clip_id=2777 |website=Loudoun.gov}}</ref> * Greater Noida, India (2023)<ref name=":1" /> * Holmes County, Mississippi (2019)<ref>{{Cite web |last1=Golski |first1=Ann |last2=Weitz |first2=Caleb |date=April 18, 2019 |title=Partnership Agreement with Holmes County, Mississippi |url=https://loudoun.granicus.com/MetaViewer.php?view_id=88&clip_id=5850&meta_id=158423 |website=Loudoun.gov}}</ref> * Karsiyaka, Turkey (2013)<ref>{{Cite web |last=York |first=Scott |date=December 4, 2013 |title=20. Board Member Initiative: Partnership with Karsiyaka Municipality, Turkey (York) |url=https://loudoun.granicus.com/GeneratedAgendaViewer.php?view_id=88&clip_id=3545 |website=Loudoun.gov}}</ref> * Main-Taunus-Kreis, Germany (2006)<ref>{{Cite web |date=July 18, 2006 |title=13c. Economic Development Commission's Resolution of Support for the Sister County Relationship between Loudoun County, Virginia and Main-Taunus-Kreis, Federal Republic of Germany |url=https://loudoun.granicus.com/player/clip/173?view_id=88&meta_id=13708&redirect=true&h=86974f3d6fda20edf2106439017be24e |website=Loudoun.gov}}</ref> * New Taipei City, Taiwan (2012)<ref>{{Cite web |last=York |first=Scott |date=May 1, 2012 |title=8. *Sister County Relationship between Loudoun County, Virginia and New Taipei, Taiwan (York) |url=https://loudoun.granicus.com/player/clip/2184?view_id=88&meta_id=63260&redirect=true&h=674da9d11a0aa09f4169503524121e97 |website=Loudoun.gov}}</ref> * Tema, Ghana (2023)<ref name=":1" />
==See also== {{Portal|Virginia}}
*Loudoun Water *Loudoun v. Board of Trustees of the Loudoun County Library *National Register of Historic Places listings in Loudoun County, Virginia *List of wineries in Virginia *Loudoun Symphony Orchestra
==Explanatory notes== {{Notelist}}
==References== {{Reflist}}
==External links== {{Commons category|Loudoun County, Virginia}} {{Wikivoyage|Loudoun County}} * {{Official website|http://www.loudoun.gov/}} * [http://www.loudounchamber.org/ Loudoun County Chamber of Commerce] * [http://www.visitloudoun.org/ Travel Information: Loudoun Convention & Visitors Association] {{Gutenberg|no=17485|name=History and Comprehensive Description of Loudoun County, Virginia, by James W. Head, 1908}} * {{webarchive |url=https://web.archive.org/web/20011026100924/http://www.loudoun.gov/ |date=October 26, 2001 |title=Loudoun County }}
{{Geographic location |Centre = Loudoun County, Virginia |North = Frederick County, Maryland |Northeast = Montgomery County, Maryland |East = Fairfax County |Southeast = Prince William County |South = Fauquier County |Southwest = |West = Jefferson County, West Virginia and Clarke County |Northwest = Washington County, Maryland }}
{{Loudoun County, Virginia topics}} {{Loudoun County, Virginia}} {{Virginia}} {{DCMetroArea}} {{Authority control}} {{Coord|39.09|-77.64|display=title|type:adm2nd_region:US-VA_source:UScensus1990}}
Category:Loudoun County, Virginia Category:Virginia counties Category:Northern Virginia counties Category:Virginia counties on the Potomac River Category:Counties and county equivalents of the Washington metropolitan area Category:States and territories established in 1757 Category:1750s establishments in the Colony of Virginia Category:1757 establishments in the Thirteen Colonies