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Alum Rock (CDP), California

Coordinates: 37°22′3″N 121°49′32″W / 37.36750°N 121.82556°W / 37.36750; -121.82556
From Tilcayo Cats, the lean encyclopaedia by Tilcayo Knowledge Systems
Not to be confused with Alum Rock, San Jose, the broader neighborhood of San Jose.

Alum Rock
Census designated place
Coordinates: 37°22′3″N 121°49′32″W / 37.36750°N 121.82556°W / 37.36750; -121.82556
CountryUnited States
StateCalifornia
CountySanta Clara
Area
[1]
 • Total
0.87 sq mi (2.25 km2)
 • Land0.87 sq mi (2.25 km2)
 • Water0 sq mi (0.00 km2)
Elevation
[2]
164 ft (50 m)
Population
 (2020)
 • Total
12,042
 • Density13,858.4/sq mi (5,350.74/km2)
Time zoneUTC-8 (Pacific)
 • Summer (DST)UTC-7 (PDT)
ZIP code
95127
Area codes408/669
FIPS code06-01458
GNIS feature ID2407736[2]

Alum Rock is a census-designated place in Santa Clara County, California, United States.

Demographics

Historical population
CensusPop.Note%±
200013,479—
201015,53615.3%
202012,042−22.5%
U.S. Decennial Census[3]
1860–1870[4][5] 1880-1890[6]
1900[7] 1910[8] 1920[9]
1930[10] 1940[11] 1950[12]
1960[13][14] 1970[15] 1980[16]
1990[17] 2000[18] 2010[19]

Alum Rock first appeared as a census designated place in the 2000 U.S. census.[18]

The 2020 United States census reported that the CDP had a population of 12,042. The population density was 13,857.3 inhabitants per square mile (5,350.3/km2). The racial makeup of the CDP was 16.7% White, 1.4% African American, 3.4% Native American, 19.0% Asian, 0.3% Pacific Islander, 43.3% from other races, and 15.8% from two or more races. Hispanic or Latino of any race were 67.1% of the population.[20]

The census reported that 98.7% of the population lived in households, 0.4% lived in non-institutionalized group quarters, and 1.0% were institutionalized.[20]

There were 2,922 households, out of which 47.1% included children under the age of 18, 53.1% were married-couple households, 7.2% were cohabiting couple households, 24.0% had a female householder with no partner present, and 15.7% had a male householder with no partner present. 14.1% of households were one person, and 5.8% were one person aged 65 or older. The average household size was 4.07.[20] There were 2,332 families (79.8% of all households).[21]

The age distribution was 23.4% under the age of 18, 10.3% aged 18 to 24, 29.1% aged 25 to 44, 25.5% aged 45 to 64, and 11.7% who were 65 years of age or older. The median age was 35.8 years. For every 100 females, there were 103.8 males.[20]

There were 3,029 housing units at an average density of 3,485.6 units per square mile (1,345.8 units/km2), of which 2,922 (96.5%) were occupied. Of these, 62.0% were owner-occupied, and 38.0% were occupied by renters.[20]

In 2023, the US Census Bureau estimated that 45.3% of the population were foreign-born. Of all people aged 5 or older, 27.3% spoke only English at home, 54.6% spoke Spanish, 1.9% spoke other Indo-European languages, 16.0% spoke Asian or Pacific Islander languages, and 0.2% spoke other languages. Of those aged 25 or older, 66.8% were high school graduates and 19.8% had a bachelor's degree.[22]

The median household income was $111,976, and the per capita income was $34,255. About 5.1% of families and 8.7% of the population were below the poverty line.[23]

Government

In the California State Legislature, Alum Rock is in the 15th senatorial district, represented by Democrat Dave Cortese, and in the 25th Assembly district, represented by Democrat Ash Kalra.[24]

In the United States House of Representatives, Alum Rock is in California's 18th congressional district, represented by Democrat Zoe Lofgren.[25]

Education

Most of Alum Rock CDP is in Alum Rock Union Elementary School District. A small portion is in Mount Pleasant Elementary School District. All of it is in East Side Union High School District.[26]

References

  1. ↑ "2020 U.S. Gazetteer Files". United States Census Bureau. Retrieved October 30, 2021.
  2. ↑ 2.0 2.1 U.S. Geological Survey Geographic Names Information System: Alum Rock (CDP), California
  3. ↑ "Decennial Census by Decade". United States Census Bureau.
  4. ↑ "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.
  5. ↑ "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.
  6. ↑ "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.
  7. ↑ "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.
  8. ↑ "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.
  9. ↑ "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.
  10. ↑ "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.
  11. ↑ "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.
  12. ↑ "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.
  13. ↑ "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.
  14. ↑ "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.
  15. ↑ "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.
  16. ↑ "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.
  17. ↑ "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.
  18. ↑ 18.0 18.1 "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.
  19. ↑ "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.
  20. ↑ 20.0 20.1 20.2 20.3 20.4 "Alum Rock CDP, California; DP1: Profile of General Population and Housing Characteristics - 2020 Census of Population and Housing". US Census Bureau. Retrieved March 31, 2025.
  21. ↑ "Alum Rock CDP, California; P16: Household Type - 2020 Census of Population and Housing". US Census Bureau. Retrieved March 31, 2025.
  22. ↑ "Alum Rock CDP, California; CP02: Comparative Social Characteristics in the United States - 2023 ACS 5-Year Estimates Comparison Profiles". US Census Bureau. Retrieved March 31, 2025.
  23. ↑ "Alum Rock CDP, California; DP03: Selected Economic Characteristics - 2023 ACS 5-Year Estimates Comparison Profiles". US Census Bureau. Retrieved March 31, 2025.
  24. ↑ "Find Your California Representatives". Retrieved July 16, 2025.
  25. ↑ "California's 18th Congressional District - Representatives & District Map". Civic Impulse, LLC.
  26. ↑ Geography Division (January 6, 2021). 2020 CENSUS - SCHOOL DISTRICT REFERENCE MAP: Santa Clara County, CA (PDF) (Map). U.S. Census Bureau. p. 1 (PDF p. 2/5). Retrieved July 20, 2022. - Text list
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