Alto, California

Alto
Census-designated place
Location of Alto in Marin County, California.
Location of Alto in Marin County, California.
Alto is located in California
Alto
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
CountyMarin
MetroSan Francisco Bay Area
Area
[1]
 • Total
0.13 sq mi (0.33 km2)
 • Land0.13 sq mi (0.33 km2)
 • Water0 sq mi (0.00 km2)  0%
Elevation
[2]
26 ft (8 m)
Population
 (2020)
 • Total
732
 • Density5,821.2/sq mi (2,247.56/km2)
Time zoneUTC-8 (Pacific (PST))
 • Summer (DST)UTC-7 (PDT)
ZIP Code
94941
Area codes415/628
GNIS feature ID218191; 2582933
U.S. Geological Survey Geographic Names Information System: Alto, California; U.S. Geological Survey Geographic Names Information System: Alto, California

Alto (Spanish for "Tall") is a census-designated place[3] adjacent to Mill Valley, California, United States, located in Marin County.[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, the CDP covered an area of 0.326 square kilometers (0.126 mi2), all land.

Demographics

Historical population
CensusPop.Note%±
2010711—
20207323.0%
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 in the 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, 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 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 (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 and the Tamalpais Union High School District.[26]

References

  1. ↑ "2020 U.S. Gazetteer Files". United States Census Bureau. Retrieved October 30, 2021.
  2. 1 2 3 U.S. Geological Survey Geographic Names Information System: Alto, California
  3. ↑ U.S. Geological Survey Geographic Names Information System: Alto, California
  4. ↑ "Decennial Census by Decade". United States Census Bureau.
  5. ↑ "1870 Census of Population - Population of Civil Divisions less than Counties - California - Almeda County to Sutter County" (PDF). United States Census Bureau. Archived from the original (PDF) on January 26, 2025 – via Wayback Machine.
  6. ↑ "1870 Census of Population - Population of Civil Divisions less than Counties - California - Tehama County to Yuba County" (PDF). United States Census Bureau. Archived from the original (PDF) on February 2, 2025 – via Wayback Machine.
  7. ↑ "1890 Census of Population - Population of California by Minor Civil Divisions" (PDF). United States Census Bureau. Archived from the original (PDF) on March 11, 2025 – via Wayback Machine.
  8. ↑ "1900 Census of Population - Population of California by Counties and Minor Civil Divisions" (PDF). United States Census Bureau. Archived from the original (PDF) on March 4, 2025 – via Wayback Machine.
  9. ↑ "1910 Census of Population - Supplement for California" (PDF). United States Census Bureau. Archived from the original (PDF) on April 4, 2025. Retrieved February 4, 2025 – via Wayback Machine.
  10. ↑ "1920 Census of Population - Number of Inhabitants - California" (PDF). United States Census Bureau. Archived from the original (PDF) on April 28, 2025 – via Wayback Machine.
  11. ↑ "1930 Census of Population - Number and Distribution of Inhabitants - California" (PDF). United States Census Bureau. Archived from the original (PDF) on March 17, 2025 – via Wayback Machine.
  12. ↑ "1940 Census of Population - Number of Inhabitants - California" (PDF). United States Census Bureau. Archived from the original (PDF) on January 26, 2025 – via Wayback Machine.
  13. ↑ "1950 Census of Population - Number of Inhabitants - California" (PDF). United States Census Bureau. Archived from the original (PDF) on February 19, 2025 – via Wayback Machine.
  14. ↑ "1960 Census of Population - Number of Inhabitants - California" (PDF). United States Census Bureau. Archived from the original (PDF) on March 22, 2025 – via Wayback Machine.
  15. ↑ "1960 Census of Population - General population Characteristics - California" (PDF). United States Census Bureau. Archived from the original (PDF) on March 22, 2025 – via Wayback Machine.
  16. ↑ "1970 Census of Population - Number of Inhabitants - California" (PDF). United States Census Bureau. Archived from the original (PDF) on February 26, 2025 – via Wayback Machine.
  17. ↑ "1980 Census of Population - Number of Inhabitants - California" (PDF). United States Census Bureau. Archived from the original (PDF) on January 26, 2025 – via Wayback Machine.
  18. ↑ "1990 Census of Population - Population and Housing Unit Counts - California" (PDF). United States Census Bureau. Archived from the original (PDF) on January 26, 2025 – via Wayback Machine.
  19. ↑ "2000 Census of Population - Population and Housing Unit Counts - California" (PDF). United States Census Bureau. Archived from the original (PDF) on March 22, 2025 – via Wayback Machine.
  20. 1 2 "2010 Census of Population - Population and Housing Unit Counts - California" (PDF). United States Census Bureau. Archived from the original (PDF) on March 28, 2025 – via Wayback Machine.
  21. ↑ "P2: Hispanic or Latino, and Not Hispanic or Latino by Race – 2010: DEC Redistricting Data (PL 94-171) – Alto CDP, California". United States Census Bureau.
  22. ↑ "P2: Hispanic or Latino, and Not Hispanic or Latino by Race – 2020: DEC Redistricting Data (PL 94-171) – Alto CDP, California". United States Census Bureau.
  23. 1 2 3 "2020 Decennial Census Demographic Profile (DP1)". United States Census Bureau. 2021. Retrieved April 27, 2026.
  24. ↑ "2020 Decennial Census Redistricting Data (Public Law 94-171)". United States Census Bureau. 2021. Retrieved April 27, 2026.
  25. ↑ "2020 Decennial Census Demographic and Housing Characteristics (DHC)". United States Census Bureau. 2023. Retrieved April 27, 2026.
  26. ↑ "2020 CENSUS - SCHOOL DISTRICT REFERENCE MAP: Marin County, CA" (PDF). U.S. Census Bureau. Retrieved April 28, 2023. - Text list
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