# Alto, California

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Alto%2C_California
> Markdown URL: https://mediated.wiki/source/Alto%2C_California.md
> Source: https://en.wikipedia.org/wiki/Alto%2C_California
> Source revision: 1355072875
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

Not to be confused with [Alta, California](/source/Alta%2C_California).

Census-designated place in California, United States

Alto Census-designated place Location of Alto in Marin County, California. Alto Location in California Coordinates: 37°54′16″N 122°31′32″W / 37.90444°N 122.52556°W / 37.90444; -122.52556 Country United States State California County Marin Metro San Francisco Bay Area Area [1] • Total 0.13 sq mi (0.33 km2) • Land 0.13 sq mi (0.33 km2) • Water 0 sq mi (0.00 km2) 0% Elevation [2] 26 ft (8 m) Population (2020) • Total 732 • Density 5,821.2/sq mi (2,247.56/km2) Time zone UTC-8 (Pacific (PST)) • Summer (DST) UTC-7 (PDT) GNIS feature ID 218191; 2582933 U.S. Geological Survey Geographic Names Information System: Alto, California; U.S. Geological Survey Geographic Names Information System: Alto, California

**Alto** ([Spanish](/source/Spanish_language) for "Tall") is a [census-designated place](/source/Census-designated_place)[3] adjacent to [Mill Valley, California](/source/Mill_Valley%2C_California), United States, located in [Marin County](/source/Marin_County%2C_California).[2] It lies at an elevation of 26 feet (8 m).[2] The population was 732 at the 2020 census.

## Geography

According to the [United States Census Bureau](/source/United_States_Census_Bureau), the CDP covered an area of 0.326 square kilometers (0.126 mi2), all land.

## Demographics

Historical population Census Pop. Note %± 2010 711 — 2020 732 3.0% U.S. Decennial Census[4] 1860–1870[5][6] 1880-1890[7] 1900[8] 1910[9] 1920[10] 1930[11] 1940[12] 1950[13] 1960[14][15] 1970[16] 1980[17] 1990[18] 2000[19] 2010[20] 2020

Alto first appeared as a [census-designated place](/source/Census-designated_place) in the [2010 United States census](/source/2010_United_States_census).[20]

### Racial and ethnic composition

Alto CDP, California – Racial and ethnic composition 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 2010[21] Pop 2020[22] % 2010 % 2020 White alone (NH) 585 571 82.28% 78.01% Black or African American alone (NH) 6 2 0.84% 0.27% Native American or Alaska Native alone (NH) 1 0 0.14% 0.00% Asian alone (NH) 29 31 4.08% 4.23% Native Hawaiian or Pacific Islander alone (NH) 1 1 0.14% 0.14% Other race alone (NH) 5 13 0.70% 1.78% Mixed race or Multiracial (NH) 33 57 4.64% 7.79% Hispanic or Latino (any race) 51 57 7.17% 7.79% Total 711 732 100.00% 100.00%

### 2020 census

As of the [2020 census](/source/2020_United_States_census), Alto had a population of 732. The population density was 5,809.5 inhabitants per square mile (2,243.1/km2). The median age was 42.7 years. 24.5% of residents were under the age of 18, 4.9% aged 18 to 24, 23.2% aged 25 to 44, 33.3% aged 45 to 64, and 14.1% of residents were 65 years of age or older. For every 100 females there were 98.4 males, and for every 100 females age 18 and over there were 91.3 males age 18 and over.[23][24]

100.0% of residents lived in urban areas, while 0.0% lived in rural areas.[25]

There were 294 households, of which 34.0% had children under the age of 18 living in them. Of all households, 51.0% were married-couple households, 5.8% were [cohabiting](/source/Cohabitation) couple households, 15.3% were households with a male householder and no spouse or partner present, and 27.9% were households with a female householder and no spouse or partner present. About 28.9% of all households were made up of individuals and 9.6% had someone living alone who was 65 years of age or older. The average household size was 2.49. There were 193 [families](/source/Family_(U.S._Census)) (65.6% of all households).[23]

There were 314 housing units at an average density of 2,492.1 units per square mile (962.2 units/km2), of which 6.4% were vacant. The homeowner vacancy rate was 0.0% and the rental vacancy rate was 2.8%. Of occupied units, 52.7% were owner-occupied and 47.3% were occupied by renters.[23]

## Education

The community is in the [Mill Valley Elementary School District](/source/Mill_Valley_School_District) and the [Tamalpais Union High School District](/source/Tamalpais_Union_High_School_District).[26]

## References

1. **[^](#cite_ref-CenPopGazetteer2020_1-0)** ["2020 U.S. Gazetteer Files"](https://www2.census.gov/geo/docs/maps-data/data/gazetteer/2020_Gazetteer/2020_gaz_place_06.txt). United States Census Bureau. Retrieved October 30, 2021.

1. ^ [***a***](#cite_ref-gnis_2-0) [***b***](#cite_ref-gnis_2-1) [***c***](#cite_ref-gnis_2-2) [U.S. Geological Survey Geographic Names Information System: Alto, California](https://edits.nationalmap.gov/apps/gaz-domestic/public/search/names/218191)

1. **[^](#cite_ref-3)** [U.S. Geological Survey Geographic Names Information System: Alto, California](https://edits.nationalmap.gov/apps/gaz-domestic/public/search/names/2582933)

1. **[^](#cite_ref-DecennialCensus_4-0)** ["Decennial Census by Decade"](https://www.census.gov/programs-surveys/decennial-census/decade.html). *[United States Census Bureau](/source/United_States_Census_Bureau)*.

1. **[^](#cite_ref-1870CensusCA1_5-0)** ["1870 Census of Population - Population of Civil Divisions less than Counties - California - Almeda County to Sutter County"](https://web.archive.org/web/20250126025002/https://www2.census.gov/library/publications/decennial/1870/population/1870a-12.pdf) (PDF). *[United States Census Bureau](/source/United_States_Census_Bureau)*. Archived from [the original](https://www2.census.gov/library/publications/decennial/1870/population/1870a-12.pdf) (PDF) on January 26, 2025 – via [Wayback Machine](/source/Wayback_Machine).

1. **[^](#cite_ref-1870CensusCA2_6-0)** ["1870 Census of Population - Population of Civil Divisions less than Counties - California - Tehama County to Yuba County"](https://web.archive.org/web/20250202095153/https://www2.census.gov/library/publications/decennial/1870/population/1870a-13.pdf) (PDF). *[United States Census Bureau](/source/United_States_Census_Bureau)*. Archived from [the original](https://www2.census.gov/library/publications/decennial/1870/population/1870a-13.pdf) (PDF) on February 2, 2025 – via [Wayback Machine](/source/Wayback_Machine).

1. **[^](#cite_ref-1890CensusCA_7-0)** ["1890 Census of Population - Population of California by Minor Civil Divisions"](https://web.archive.org/web/20250311213742/https://www2.census.gov/library/publications/decennial/1890/bulletins/demographics/134-population-of-ca.pdf) (PDF). *[United States Census Bureau](/source/United_States_Census_Bureau)*. Archived from [the original](https://www2.census.gov/library/publications/decennial/1890/bulletins/demographics/134-population-of-ca.pdf) (PDF) on March 11, 2025 – via [Wayback Machine](/source/Wayback_Machine).

1. **[^](#cite_ref-1900CensusCA_8-0)** ["1900 Census of Population - Population of California by Counties and Minor Civil Divisions"](https://web.archive.org/web/20250304013034/https://www2.census.gov/library/publications/decennial/1900/bulletins/demographic/10-population-ca.pdf) (PDF). *[United States Census Bureau](/source/United_States_Census_Bureau)*. Archived from [the original](https://www2.census.gov/library/publications/decennial/1900/bulletins/demographic/10-population-ca.pdf) (PDF) on March 4, 2025 – via [Wayback Machine](/source/Wayback_Machine).

1. **[^](#cite_ref-1910CensusCA_9-0)** ["1910 Census of Population - Supplement for California"](https://web.archive.org/web/20250404180724/https://web.archive.org/web/20240823050629/https://www2.census.gov/library/publications/decennial/1910/abstract/supplement-ca.pdf) (PDF). *[United States Census Bureau](/source/United_States_Census_Bureau)*. Archived from [the original](https://www2.census.gov/library/publications/decennial/1910/abstract/supplement-ca.pdf) (PDF) on April 4, 2025. Retrieved February 4, 2025 – via [Wayback Machine](/source/Wayback_Machine).

1. **[^](#cite_ref-1920CensusCA_10-0)** ["1920 Census of Population - Number of Inhabitants - California"](https://web.archive.org/web/20250428023259/https://www2.census.gov/library/publications/decennial/1920/bulletins/demographics/population-ca-number-of-inhabitants.pdf) (PDF). *[United States Census Bureau](/source/United_States_Census_Bureau)*. Archived from [the original](https://www2.census.gov/library/publications/decennial/1920/bulletins/demographics/population-ca-number-of-inhabitants.pdf) (PDF) on April 28, 2025 – via [Wayback Machine](/source/Wayback_Machine).

1. **[^](#cite_ref-1930CensusCA_11-0)** ["1930 Census of Population - Number and Distribution of Inhabitants - California"](https://web.archive.org/web/20250317202706/https://www2.census.gov/library/publications/decennial/1930/population-volume-1/03815512v1ch03.pdf) (PDF). *[United States Census Bureau](/source/United_States_Census_Bureau)*. Archived from [the original](https://www2.census.gov/library/publications/decennial/1930/population-volume-1/03815512v1ch03.pdf) (PDF) on March 17, 2025 – via [Wayback Machine](/source/Wayback_Machine).

1. **[^](#cite_ref-1940CensusCA_12-0)** ["1940 Census of Population - Number of Inhabitants - California"](https://web.archive.org/web/20250126024959/https://www2.census.gov/library/publications/decennial/1940/population-volume-1/33973538v1ch03.pdf) (PDF). *[United States Census Bureau](/source/United_States_Census_Bureau)*. Archived from [the original](https://www2.census.gov/library/publications/decennial/1940/population-volume-1/33973538v1ch03.pdf) (PDF) on January 26, 2025 – via [Wayback Machine](/source/Wayback_Machine).

1. **[^](#cite_ref-1950CensusCA_13-0)** ["1950 Census of Population - Number of Inhabitants - California"](https://web.archive.org/web/20250219112141/https://www2.census.gov/library/publications/decennial/1950/population-volume-1/vol-01-08.pdf) (PDF). *[United States Census Bureau](/source/United_States_Census_Bureau)*. Archived from [the original](https://www2.census.gov/library/publications/decennial/1950/population-volume-1/vol-01-08.pdf) (PDF) on February 19, 2025 – via [Wayback Machine](/source/Wayback_Machine).

1. **[^](#cite_ref-1960CensusCA_14-0)** ["1960 Census of Population - Number of Inhabitants - California"](https://web.archive.org/web/20250322000358/https://www2.census.gov/library/publications/decennial/1960/population-volume-1/vol-01-06-c.pdf) (PDF). *[United States Census Bureau](/source/United_States_Census_Bureau)*. Archived from [the original](https://www2.census.gov/library/publications/decennial/1960/population-volume-1/vol-01-06-c.pdf) (PDF) on March 22, 2025 – via [Wayback Machine](/source/Wayback_Machine).

1. **[^](#cite_ref-1960CensusCA1_15-0)** ["1960 Census of Population - General population Characteristics - California"](https://web.archive.org/web/20250322000356/https://www2.census.gov/library/publications/decennial/1960/population-volume-1/vol-01-06-d.pdf) (PDF). *[United States Census Bureau](/source/United_States_Census_Bureau)*. Archived from [the original](https://www2.census.gov/library/publications/decennial/1960/population-volume-1/vol-01-06-d.pdf) (PDF) on March 22, 2025 – via [Wayback Machine](/source/Wayback_Machine).

1. **[^](#cite_ref-1970CensusCA_16-0)** ["1970 Census of Population - Number of Inhabitants - California"](https://web.archive.org/web/20250226084958/https://www2.census.gov/prod2/decennial/documents/1970a_ca1-01.pdf) (PDF). *[United States Census Bureau](/source/United_States_Census_Bureau)*. Archived from [the original](https://www2.census.gov/prod2/decennial/documents/1970a_ca1-01.pdf) (PDF) on February 26, 2025 – via [Wayback Machine](/source/Wayback_Machine).

1. **[^](#cite_ref-1980CensusCA_17-0)** ["1980 Census of Population - Number of Inhabitants - California"](https://web.archive.org/web/20250126024959/https://www2.census.gov/prod2/decennial/documents/1980a_caAB-01.pdf) (PDF). *[United States Census Bureau](/source/United_States_Census_Bureau)*. Archived from [the original](https://www2.census.gov/prod2/decennial/documents/1980a_caAB-01.pdf) (PDF) on January 26, 2025 – via [Wayback Machine](/source/Wayback_Machine).

1. **[^](#cite_ref-1990CensusCA_18-0)** ["1990 Census of Population - Population and Housing Unit Counts - California"](https://web.archive.org/web/20250126025005/https://www2.census.gov/prod2/cen1990/cph2/cph-2-6.pdf) (PDF). *[United States Census Bureau](/source/United_States_Census_Bureau)*. Archived from [the original](https://www2.census.gov/prod2/cen1990/cph2/cph-2-6.pdf) (PDF) on January 26, 2025 – via [Wayback Machine](/source/Wayback_Machine).

1. **[^](#cite_ref-2000CensusCA_19-0)** ["2000 Census of Population - Population and Housing Unit Counts - California"](https://web.archive.org/web/20250322000357/https://www2.census.gov/library/publications/2003/dec/phc-3-6.pdf) (PDF). *[United States Census Bureau](/source/United_States_Census_Bureau)*. Archived from [the original](https://www2.census.gov/library/publications/2003/dec/phc-3-6.pdf) (PDF) on March 22, 2025 – via [Wayback Machine](/source/Wayback_Machine).

1. ^ [***a***](#cite_ref-2010CensusCA_20-0) [***b***](#cite_ref-2010CensusCA_20-1) ["2010 Census of Population - Population and Housing Unit Counts - California"](https://web.archive.org/web/20250328034325/https://www2.census.gov/library/publications/decennial/2010/cph-2/cph-2-6.pdf) (PDF). *[United States Census Bureau](/source/United_States_Census_Bureau)*. Archived from [the original](https://www2.census.gov/library/publications/decennial/2010/cph-2/cph-2-6.pdf) (PDF) on March 28, 2025 – via [Wayback Machine](/source/Wayback_Machine).

1. **[^](#cite_ref-2010CensusP2_21-0)** ["P2: Hispanic or Latino, and Not Hispanic or Latino by Race – 2010: DEC Redistricting Data (PL 94-171) – Alto CDP, California"](https://data.census.gov/cedsci/table?q=p2&g=160XX00US0601416&tid=DECENNIALPL2010.P2). *[United States Census Bureau](/source/United_States_Census_Bureau)*.

1. **[^](#cite_ref-2020CensusP2_22-0)** ["P2: Hispanic or Latino, and Not Hispanic or Latino by Race – 2020: DEC Redistricting Data (PL 94-171) – Alto CDP, California"](https://data.census.gov/cedsci/table?q=p2&g=160XX00US0601416&tid=DECENNIALPL2020.P2). *[United States Census Bureau](/source/United_States_Census_Bureau)*.

1. ^ [***a***](#cite_ref-Census2020DP_23-0) [***b***](#cite_ref-Census2020DP_23-1) [***c***](#cite_ref-Census2020DP_23-2) ["2020 Decennial Census Demographic Profile (DP1)"](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_0133P,DP1_0137P,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=place%3A01416&in=state%3A06). *United States Census Bureau*. 2021. Retrieved April 27, 2026.

1. **[^](#cite_ref-Census2020PL_24-0)** ["2020 Decennial Census Redistricting Data (Public Law 94-171)"](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=place%3A01416&in=state%3A06). *United States Census Bureau*. 2021. Retrieved April 27, 2026.

1. **[^](#cite_ref-Census2020DHC_25-0)** ["2020 Decennial Census Demographic and Housing Characteristics (DHC)"](https://api.census.gov/data/2020/dec/dhc?get=NAME,P2_002N,P2_003N&for=place%3A01416&in=state%3A06). *United States Census Bureau*. 2023. Retrieved April 27, 2026.

1. **[^](#cite_ref-26)** ["2020 CENSUS - SCHOOL DISTRICT REFERENCE MAP: Marin County, CA"](https://www2.census.gov/geo/maps/DC2020/PL20/st06_ca/schooldistrict_maps/c06041_marin/DC20SD_C06041.pdf) (PDF). [U.S. Census Bureau](/source/U.S._Census_Bureau). Retrieved April 28, 2023. - [Text list](https://www2.census.gov/geo/maps/DC2020/PL20/st06_ca/schooldistrict_maps/c06041_marin/DC20SD_C06041_SD2MS.txt)

v t e Municipalities and communities of Marin County, California, United States County seat: San Rafael Cities and towns Belvedere Corte Madera Fairfax Larkspur Mill Valley Novato Ross San Anselmo San Rafael Sausalito Tiburon Marin County map CDPs Alto Black Point-Green Point Bolinas Dillon Beach Inverness Kentfield Lagunitas-Forest Knolls Lucas Valley-Marinwood Marin City Muir Beach Nicasio Point Reyes Station San Geronimo Santa Venetia Sleepy Hollow Stinson Beach Strawberry Tamalpais-Homestead Valley Tomales Woodacre Unincorporated communities Bel Marin Keys California Park Dogtown Fallon Forest Knolls Greenbrae Hamlet Ignacio Inverness Park Lagunitas Los Ranchitos Marconi Marshall Olema Paradise Cay San Quentin Tamalpais Valley Tocaloma Former settlements Jewell Olompali Taylorville California portal United States portal

v t e San Francisco Bay Area Bodies of water Bodega Bay Carquinez Strait Clifton Forebay Golden Gate Grizzly Bay Guadalupe River Half Moon Bay Lake Berryessa Napa River Oakland Estuary Petaluma River Richardson Bay Richmond Inner Harbor Russian River Sacramento River San Francisco Bay San Leandro Bay San Pablo Bay Sonoma Creek Suisun Bay Tomales Bay Counties Alameda Contra Costa Marin Napa San Francisco San Mateo Santa Clara Solano Sonoma Cities and towns Major cities Oakland San Francisco San Jose 100k–250k Antioch Berkeley Concord Daly City Fairfield Fremont Hayward Richmond San Mateo Santa Clara Santa Rosa Sunnyvale Vacaville Vallejo 50k–100k Alameda Brentwood Cupertino Dublin Gilroy Livermore Milpitas Mountain View Napa Novato Palo Alto Petaluma Pittsburg Pleasanton Redwood City San Leandro San Rafael San Ramon South San Francisco Union City Walnut Creek 25k–50k Belmont Benicia Burlingame Campbell Danville East Palo Alto El Cerrito Foster City Hercules Lafayette Los Altos Los Gatos Martinez Menlo Park Morgan Hill Newark Oakley Pacifica Pleasant Hill Rohnert Park San Bruno San Carlos San Pablo Saratoga Suisun City Windsor 10k–25k Albany American Canyon Clayton Corte Madera Dixon Emeryville Half Moon Bay Healdsburg Hillsborough Larkspur Mill Valley Millbrae Moraga Orinda Piedmont Pinole Rio Vista San Anselmo Sonoma Under 10k Atherton Belvedere Brisbane Calistoga Cloverdale Colma Cotati Fairfax Los Altos Hills Monte Sereno Portola Valley Ross St. Helena Sausalito Sebastopol Tiburon Woodside Yountville CDPs over 10k Alamo Alum Rock Ashland Bay Point Castro Valley Cherryland Discovery Bay El Sobrante Fairview North Fair Oaks San Lorenzo Stanford Tamalpais-Homestead Valley Sub-regions East Bay North Bay Peninsula San Francisco South Bay Other Homelessness Politics Sports Transportation

---
Adapted from the Wikipedia article [Alto, California](https://en.wikipedia.org/wiki/Alto%2C_California) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Alto%2C_California?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.