San Geronimo, California

{{Use American English|date=July 2025}} {{Use mdy dates|date=January 2025}} {{Infobox settlement |official_name = San Geronimo |settlement_type = Unincorporated Community Census Designated Place |image_skyline = |imagesize = |image_caption = |image_seal = |image_map = Marin_County_California_Incorporated_and_Unincorporated_areas_San_Geronimo_Highlighted.svg |mapsize = 250x200px |map_caption = Location in Marin County and the state of California |image_map1 = |mapsize1 = |map_caption1 = | pushpin_map = USA | pushpin_map_caption = Location in the United States |subdivision_type = Country |subdivision_name = {{USA}} |subdivision_type1 = State |subdivision_name1 = {{flag|California}} |subdivision_type2 = County |subdivision_name2 = Marin |government_type = |leader_title = Supervisor |leader_name = District 4 Dennis Rodoni |leader_title1 = State senator |leader_name1 = {{Representative|casd|2|fmt=sleader}}<ref name=ccrc>{{Cite web |title=Final Maps {{!}} California Citizens Redistricting Commission |url=https://wedrawthelines.ca.gov/final-maps/ |access-date=October 15, 2025 |language=en}}</ref> |leader_title2 = Assemblymember |leader_name2 = {{Representative|caad|12|fmt=sleader}}<ref name=ccrc/> |leader_title3 = U. S. rep. |leader_name3 = {{Representative|cacd|2|fmt=usleader}}<ref>{{Cite GovTrack|CA|2|accessdate=October 15, 2025}}</ref> |established_date =  | unit_pref = US | area_footnotes = <ref name="CenPopGazetteer2021">{{cite web |title=2021 U.S. Gazetteer Files: California |url=https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2021_Gazetteer/2021_gaz_place_06.txt |publisher=United States Census Bureau |accessdate=July 8, 2022}}</ref> | area_total_sq_mi = 1.508 | area_land_sq_mi = 1.508 | area_water_sq_mi = 0 | area_total_km2 = | area_land_km2 = | area_water_km2 = | area_water_percent = 0 | area_note =

|elevation_ft = 292 |elevation_m = 89 |population_as_of = 2020 |population_footnotes = <ref name="Census 2020">{{Cite web| url=https://data.census.gov/cedsci/table?q=&g=1600000US0667070&tid=DECENNIALPL2020.P1| title=P1. Race – San Geronimo CDP, California: 2020 DEC Redistricting Data (PL 94-171)| publisher=U.S. Census Bureau| access-date=July 8, 2022}}</ref> |population_total = 510 |population_metro = |population_density_km2 = |population_density_sq_mi = auto |timezone = Pacific |utc_offset = -8 |coordinates = {{coord|38|00|48|N|122|39|50|W|region:US-CA|display=inline,title}} |elevation_footnotes = <ref name=gnis>{{gnis|232399}}</ref> |timezone_DST = PDT |utc_offset_DST = -7 |postal_code_type = ZIP code |postal_code = 94963 |area_code_type = Area codes |area_code = 415/628 |blank_name = FIPS code |blank_info = {{FIPS|06|67070}} |blank1_name = GNIS feature ID |blank1_info = {{GNIS 4|232399}} |footnotes = |website = }} '''San Geronimo''' (Spanish: ''San Gerónimo'', meaning "St. Jerome") is a census-designated place (CDP) located in the San Geronimo Valley in Marin County, California, United States. San Geronimo is bordered by Lagunitas-Forest Knolls to its west and Woodacre to its east. It is {{convert|8|mi|0}} southwest of downtown Novato<ref name=CGN>{{California's Geographic Names|695}}</ref> at an elevation of {{convert|292|ft}}.<ref name=gnis /> The population was 510 at the 2020 census.<ref name="Census 2020"/>

==History== The first known map to depict the San Geronimo Valley was published in 1834.<ref>{{Cite web |title=Maps |url=https://www.sgvhistoricalsociety.org/maps-2 |access-date=2022-07-06 |website=San Geronimo Valley Historical Society |language=en-US}}</ref> Prior to 1877, the place was called Nicasio.<ref name=CGN /> The San Geronimo post office opened in 1895, closed in 1910, and re-opened in 1911.<ref name=CGN />

==Geography== San Geronimo is located at {{coord|38|00|48|N|122|39|50|W|type:city}}.<ref name=gnis /> According to the United States Census Bureau, the CDP has a total area of {{convert|1.5|sqmi|km2}}, all land.<ref name="CenPopGazetteer2021"/>

San Geronimo was once the home of the San Geronimo Golf Course.<ref>{{Cite web|title = Golf course review: San Geronimo GC|url = http://abc7news.com/archive/6333606/|website = ABC7 San Francisco|access-date = 2016-02-01}}</ref> In 2018, The Trust for Public Land purchased the {{convert|157|acre|adj=on}} site and has opened it to public access as a park while it works to restore habitat and conduct a planning process for future use.<ref>{{Cite web |title=The Trust for Public Land will buy San Geronimo Golf Course in Marin |url=https://www.tpl.org/media-room/trust-public-land-will-buy-san-geronimo-golf-course-marin |access-date=2022-06-01 |website=Trust for Public Land |language=en}}</ref>

==Demographics== {{US Census population |2000= 436 |2010= 446 |2020= 510 |estyear= |estimate= |estref= |align-fn=center |footnote=U.S. Decennial Census<ref name="DecennialCensus">{{cite web|url=https://www.census.gov/programs-surveys/decennial-census/decade.html|title=Decennial Census by Decade|website=United States Census Bureau|access-date=}}</ref> 1860–1870<ref name=1870CensusCA1>{{Cite web|title= 1870 Census of Population - Population of Civil Divisions less than Counties - California - Almeda County to Sutter County |url=https://www2.census.gov/library/publications/decennial/1870/population/1870a-12.pdf|website=United States Census Bureau|via= Wayback Machine |archive-url=https://web.archive.org/web/20250126025002/https://www2.census.gov/library/publications/decennial/1870/population/1870a-12.pdf| archive-date=January 26, 2025}}</ref><ref name=1870CensusCA2>{{Cite web|title= 1870 Census of Population - Population of Civil Divisions less than Counties - California - Tehama County to Yuba County |url=https://www2.census.gov/library/publications/decennial/1870/population/1870a-13.pdf|website=United States Census Bureau|via= Wayback Machine |archive-url=https://web.archive.org/web/20250202095153/https://www2.census.gov/library/publications/decennial/1870/population/1870a-13.pdf| archive-date=February 2, 2025}}</ref> 1880-1890<ref name=1890CensusCA>{{Cite web|title= 1890 Census of Population - Population of California by Minor Civil Divisions |url=https://www2.census.gov/library/publications/decennial/1890/bulletins/demographics/134-population-of-ca.pdf|website=United States Census Bureau|via= Wayback Machine |archive-url=https://web.archive.org/web/20250311213742/https://www2.census.gov/library/publications/decennial/1890/bulletins/demographics/134-population-of-ca.pdf| archive-date=March 11, 2025}}</ref> 1900<ref name=1900CensusCA>{{Cite web|title= 1900 Census of Population - Population of California by Counties and Minor Civil Divisions |url=https://www2.census.gov/library/publications/decennial/1900/bulletins/demographic/10-population-ca.pdf|website=United States Census Bureau|via= Wayback Machine |archive-url=https://web.archive.org/web/20250304013034/https://www2.census.gov/library/publications/decennial/1900/bulletins/demographic/10-population-ca.pdf| archive-date=March 4, 2025}}</ref> 1910<ref name=1910CensusCA>{{Cite web|title=1910 Census of Population - Supplement for California|url=https://www2.census.gov/library/publications/decennial/1910/abstract/supplement-ca.pdf|website=United States Census Bureau|access-date=February 4, 2025|via= Wayback Machine |archive-url=https://web.archive.org/web/20250404180724/https://web.archive.org/web/20240823050629/https://www2.census.gov/library/publications/decennial/1910/abstract/supplement-ca.pdf| archive-date= April 4, 2025}}</ref> 1920<ref name=1920CensusCA>{{Cite web|title= 1920 Census of Population - Number of Inhabitants - California |url=https://www2.census.gov/library/publications/decennial/1920/bulletins/demographics/population-ca-number-of-inhabitants.pdf|website=United States Census Bureau |via= Wayback Machine |archive-url=https://web.archive.org/web/20250428023259/https://www2.census.gov/library/publications/decennial/1920/bulletins/demographics/population-ca-number-of-inhabitants.pdf| archive-date=April 28, 2025}}</ref> 1930<ref name=1930CensusCA>{{Cite web|title= 1930 Census of Population - Number and Distribution of Inhabitants - California |url=https://www2.census.gov/library/publications/decennial/1930/population-volume-1/03815512v1ch03.pdf|website=United States Census Bureau |via= Wayback Machine |archive-url=https://web.archive.org/web/20250317202706/https://www2.census.gov/library/publications/decennial/1930/population-volume-1/03815512v1ch03.pdf| archive-date= March 17, 2025}}</ref> 1940<ref name=1940CensusCA>{{Cite web|title= 1940 Census of Population - Number of Inhabitants - California |url=https://www2.census.gov/library/publications/decennial/1940/population-volume-1/33973538v1ch03.pdf|website=United States Census Bureau |via= Wayback Machine |archive-url=https://web.archive.org/web/20250126024959/https://www2.census.gov/library/publications/decennial/1940/population-volume-1/33973538v1ch03.pdf | archive-date=January 26, 2025}}</ref> 1950<ref name=1950CensusCA>{{Cite web|title= 1950 Census of Population - Number of Inhabitants - California |url=https://www2.census.gov/library/publications/decennial/1950/population-volume-1/vol-01-08.pdf|website=United States Census Bureau |via= Wayback Machine |archive-url=https://web.archive.org/web/20250219112141/https://www2.census.gov/library/publications/decennial/1950/population-volume-1/vol-01-08.pdf | archive-date=February 19, 2025}}</ref> 1960<ref name=1960CensusCA>{{Cite web|title= 1960 Census of Population - Number of Inhabitants - California |url=https://www2.census.gov/library/publications/decennial/1960/population-volume-1/vol-01-06-c.pdf|website=United States Census Bureau |via= Wayback Machine |archive-url=https://web.archive.org/web/20250322000358/https://www2.census.gov/library/publications/decennial/1960/population-volume-1/vol-01-06-c.pdf| archive-date=March 22, 2025}}</ref><ref name=1960CensusCA1>{{Cite web|title= 1960 Census of Population - General population Characteristics - California |url=https://www2.census.gov/library/publications/decennial/1960/population-volume-1/vol-01-06-d.pdf|website=United States Census Bureau |via= Wayback Machine |archive-url=https://web.archive.org/web/20250322000356/https://www2.census.gov/library/publications/decennial/1960/population-volume-1/vol-01-06-d.pdf | archive-date=March 22, 2025}}</ref> 1970<ref name=1970CensusCA>{{Cite web|title= 1970 Census of Population - Number of Inhabitants - California |url=https://www2.census.gov/prod2/decennial/documents/1970a_ca1-01.pdf|website=United States Census Bureau |via= Wayback Machine |archive-url=https://web.archive.org/web/20250226084958/https://www2.census.gov/prod2/decennial/documents/1970a_ca1-01.pdf | archive-date=February 26, 2025}}</ref> 1980<ref name=1980CensusCA>{{Cite web|title= 1980 Census of Population - Number of Inhabitants - California |url=https://www2.census.gov/prod2/decennial/documents/1980a_caAB-01.pdf|website=United States Census Bureau |via= Wayback Machine |archive-url=https://web.archive.org/web/20250126024959/https://www2.census.gov/prod2/decennial/documents/1980a_caAB-01.pdf | archive-date=January 26, 2025}}</ref> 1990<ref name=1990CensusCA>{{Cite web|title= 1990 Census of Population - Population and Housing Unit Counts - California |url=https://www2.census.gov/prod2/cen1990/cph2/cph-2-6.pdf|website=United States Census Bureau |via= Wayback Machine |archive-url=https://web.archive.org/web/20250126025005/https://www2.census.gov/prod2/cen1990/cph2/cph-2-6.pdf| archive-date=January 26, 2025}}</ref> 2000<ref name=2000CensusCA>{{Cite web|title= 2000 Census of Population - Population and Housing Unit Counts - California |url=https://www2.census.gov/library/publications/2003/dec/phc-3-6.pdf|website=United States Census Bureau |via= Wayback Machine |archive-url=https://web.archive.org/web/20250322000357/https://www2.census.gov/library/publications/2003/dec/phc-3-6.pdf| archive-date=March 22, 2025}}</ref> 2010<ref name=2010CensusCA>{{Cite web|title= 2010 Census of Population - Population and Housing Unit Counts - California |url=https://www2.census.gov/library/publications/decennial/2010/cph-2/cph-2-6.pdf|website=United States Census Bureau |via= Wayback Machine |archive-url=https://web.archive.org/web/20250328034325/https://www2.census.gov/library/publications/decennial/2010/cph-2/cph-2-6.pdf| archive-date=March 28, 2025}}</ref> 2020 }}

San Geronimo first appeared as a census designated place in the 2000 U.S. census formed out of part of the Lagunitas-Forest Knolls CDP and the Woodacre CDP.<ref name=2000CensusCA/>

===Racial and ethnic composition=== {| class="wikitable sortable" style="text-align:center;" |+'''San Geronimo CDP, California – Racial and ethnic composition''' {{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.''}} !Race / Ethnicity (''NH = Non-Hispanic'') !Pop 2000<ref name=2000CensusP004>{{Cite web|title=P004: Hispanic or Latino, and Not Hispanic or Latino by Race – 2000: DEC Summary File 1 – San Geronimo CDP, California|url=https://data.census.gov/table?g=160XX00US0667070&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) – San Geronimo CDP, California|url=https://data.census.gov/cedsci/table?q=p2&g=160XX00US0667070&tid=DECENNIALPL2010.P2|website=United States Census Bureau |access-date= }}</ref> !style="background-color: #ffffb3;" |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) – San Geronimo CDP, California|url=https://data.census.gov/cedsci/table?q=p2&g=160XX00US0667070&tid=DECENNIALPL2020.P2|website=United States Census Bureau |access-date= }}</ref> !% 2000 !% 2010 !style="background-color: #ffffb3;" |% 2020 |- |White alone (NH) |398 |404 |style='background: #ffffe6; |416 |91.28% |90.58% |style='background: #ffffe6; |81.57% |- |Black or African American alone (NH) |4 |3 |style='background: #ffffe6; |8 |0.92% |0.67% |style='background: #ffffe6; |1.57% |- |Native American or Alaska Native alone (NH) |3 |2 |style='background: #ffffe6; |2 |0.69% |0.45% |style='background: #ffffe6; |0.39% |- |Asian alone (NH) |4 |3 |style='background: #ffffe6; |6 |0.92% |0.67% |style='background: #ffffe6; |1.18% |- |Native Hawaiian or Pacific Islander alone (NH) |2 |0 |style='background: #ffffe6; |5 |0.46% |0.00% |style='background: #ffffe6; |0.98% |- |Other race alone (NH) |1 |2 |style='background: #ffffe6; |5 |0.23% |0.45% |style='background: #ffffe6; |0.98% |- |Mixed race or Multiracial (NH) |13 |11 |style='background: #ffffe6; |30 |2.98% |2.47% |style='background: #ffffe6; |5.88% |- |Hispanic or Latino (any race) |11 |21 |style='background: #ffffe6; |38 |2.52% |4.71% |style='background: #ffffe6; |7.45% |- |'''Total''' |'''436''' |'''446''' |style='background: #ffffe6; |'''510 ''' |'''100.00%''' |'''100.00%''' |style='background: #ffffe6; |'''100.00%''' |}

===2020=== The 2020 United States census reported that San Geronimo had a population of 510. The population density was {{convert|338.2|PD/sqmi|PD/km2|sp=us|adj=off}}. The racial makeup of San Geronimo was 426 (83.5%) White, 8 (1.6%) African American, 8 (1.6%) Native American, 6 (1.2%) Asian, 5 (1.0%) Pacific Islander, 9 (1.8%) from other races, and 48 (9.4%) from two or more races. Hispanic or Latino of any race were 38 persons (7.5%).<ref name=DP1>{{cite web |title=San Geronimo CDP, California; DP1: Profile of General Population and Housing Characteristics - 2020 Census of Population and Housing |url=https://data.census.gov/table/DECENNIALDP2020.DP1?g=1600000US0667070 |website=US Census Bureau |access-date=June 2, 2025}}</ref>

The census reported that 505 people (99.0% of the population) lived in households and 5 (1.0%) were institutionalized.<ref name=DP1/>

There were 198 households, out of which 61 (30.8%) had children under the age of 18 living in them, 122 (61.6%) were married-couple households, 17 (8.6%) were cohabiting couple households, 36 (18.2%) had a female householder with no partner present, and 23 (11.6%) had a male householder with no partner present. 39 households (19.7%) were one person, and 14 (7.1%) were one person aged 65 or older. The average household size was 2.55.<ref name=DP1/> There were 143 families (72.2% of all households).<ref>{{cite web |title=San Geronimo CDP, California; P16: Household Type - 2020 Census of Population and Housing |url=https://data.census.gov/table/DECENNIALDHC2020.P16?g=1600000US0667070 |website=US Census Bureau |access-date=June 2, 2025}}</ref>

The age distribution was 105 people (20.6%) under the age of 18, 12 people (2.4%) aged 18 to 24, 70 people (13.7%) aged 25 to 44, 163 people (32.0%) aged 45 to 64, and 160 people (31.4%) who were 65{{nbsp}}years of age or older. The median age was 54.3{{nbsp}}years. For every 100 females, there were 93.9 males.<ref name=DP1/>

There were 209 housing units at an average density of {{convert|138.6|/mi2|/km2|disp=preunit|units |units|}}, of which 198 (94.7%) were occupied. Of these, 135 (68.2%) were owner-occupied, and 63 (31.8%) were occupied by renters.<ref name=DP1/>

===2010=== At the 2010 census San Geronimo had a population of 446. The population density was {{convert|295.8|PD/sqmi|PD/km2|sp=us|adj=off}}. The racial makeup of San Geronimo was 421 (94.4%) White, 3 (0.7%) African American, 2 (0.4%) Native American, 3 (0.7%) Asian, 3 (0.7%) from other races, and 14 (3.1%) from two or more races. Hispanic or Latino of any race were 21 people (4.7%).<ref>{{cite web|url=http://www.census.gov/2010census/popmap/ipmtext.php?fl=06:0667070|archive-url=https://archive.today/20140715032928/http://www.census.gov/2010census/popmap/ipmtext.php?fl=06:0667070|url-status=dead|archive-date=July 15, 2014|title=2010 Census Interactive Population Search: CA - San Geronimo CDP|publisher=U.S. Census Bureau|accessdate=July 12, 2014}}</ref>

The census reported that 100% of the population lived in households.

There were 199 households, 49 (24.6%) had children under the age of 18 living in them, 108 (54.3%) were opposite-sex married couples living together, 19 (9.5%) had a female householder with no husband present, 7 (3.5%) had a male householder with no wife present. There were 13 (6.5%) unmarried opposite-sex partnerships, and 2 (1.0%) same-sex married couples or partnerships. 43 households (21.6%) were one person and 9 (4.5%) had someone living alone who was 65 or older. The average household size was 2.24. There were 134 families (67.3% of households); the average family size was 2.60.

The age distribution was 72 people (16.1%) under the age of 18, 20 people (4.5%) aged 18 to 24, 89 people (20.0%) aged 25 to 44, 189 people (42.4%) aged 45 to 64, and 76 people (17.0%) who were 65 or older. The median age was 50.0 years. For every 100 females there were 97.3 males. For every 100 females age 18 and over, there were 94.8 males.

There were 208 housing units at an average density of {{convert|137.9|/sqmi|/km2|sp=us|adj=off}}, of which 73.4% were owner-occupied and 26.6% were occupied by renters. The homeowner vacancy rate was 0%; the rental vacancy rate was 0%. 76.5% of the population lived in owner-occupied housing units and 23.5% lived in rental housing units.

===2000=== At the 2000 census, the median household income was $58,542 and the median family income was $60,875. Males had a median income of $70,536 versus $32,292 for females. The per capita income for the CDP was $31,960. About 9.9% of families and 10.4% of the population were below the poverty line, including 18.4% of those under age 18 and none of those age 65 or over.<ref name="GR2">{{cite web|url=https://www.census.gov|publisher=United States Census Bureau|accessdate=2008-01-31|title=U.S. Census website}}</ref>

==Education== San Geronimo is served by the Lagunitas Elementary School District and the Tamalpais Union High School District.<ref>{{cite web|url=https://www2.census.gov/geo/maps/DC2020/PL20/st06_ca/schooldistrict_maps/c06041_marin/DC20SD_C06041.pdf|title=2020 CENSUS - SCHOOL DISTRICT REFERENCE MAP: Marin County, CA|publisher=U.S. Census Bureau|accessdate=2023-04-28}} - [https://www2.census.gov/geo/maps/DC2020/PL20/st06_ca/schooldistrict_maps/c06041_marin/DC20SD_C06041_SD2MS.txt Text list]</ref>

==References==

Category:Census-designated places in California Category:Census-designated places in Marin County, California Category:West Marin