Alum Rock, California Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Alum Rock, California is 11,619 as of the 2023 American Community Survey, making it the 457th-largest city in California. The median household income is $111,976, the median home value is $880,000, and the median age is 40.3.
11,619
Population
13371
People / sq mi
$111,976
Median Income
$880,000
Median Home Value
Get Alum Rock's next ACS population data
Subscribe for Population Review updates by email. No spam, unsubscribe anytime.
Alum Rock covers 0.9 sq mi of land at 13371 people per square mile.
About Alum Rock, CA
Alum Rock stands apart on settlement density — it is among the most densely settled of US cities, at roughly 13,371 people per square mile. With 11,619 residents, Alum Rock is a city in California.
Median household income is $111,976, above the US median of $78,538. Poverty runs at 5.1%, below the national 12.4%. Home prices are steep, with the typical property valued at $880,000, with typical rent around $2,412.
Degree attainment is on the lower side for US cities: 19.8% of adults hold a bachelor’s degree, below the national 35.0%. Most workers commute: only 6.1% work from home, below the national 14.0%, and the average commute runs about 30 minutes each way.
That density explains much of the rest of the profile in Alum Rock: denser places lean toward renting, shorter commutes by transit, and a younger working-age mix.
Race & Ethnicity
| White | 19.5% |
| Black or African American | 0.4% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.7% |
| Two or More Races | 0.0% |
Economy & Income
$111,976
Median Household Income
$34,255
Per Capita Income
5.1%
Poverty Rate
3.1%
Unemployment Rate
Housing
$880,000
Median Home Value
$2,412
Median Rent
70.4%
Owner-Occupied
Education
66.8%
High School+
19.8%
Bachelor's+
Commute
0.4%
Drive Alone
79.2%
Public Transit
6.1%
Work From Home
29.6 min
Avg Commute
Community Profile
5.9%
Foreign Born
27.3%
Non-English at Home
2.9%
Veterans
10.1%
With Disability
92.1%
Health Insurance
96.2%
Internet Access
Employment by Industry
| Construction | 16.5% |
| Professional, Scientific & Management | 15.7% |
| Finance, Insurance & Real Estate | 14.7% |
| Education, Health Care & Social Services | 13.7% |
| Manufacturing | 10.5% |
| Arts, Entertainment & Food Services | 7.7% |
| Retail Trade | 5.3% |
| Information | 2.5% |
| Transportation & Warehousing | 2.0% |
| Public Administration | 1.1% |
| Agriculture & Mining | 0.2% |
Largest cities in California
Largest counties in California
Part of California
Metro areas in California
City rankings
Frequently Asked Questions
Alum Rock, California has a population of 11,619 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 457th-largest city in California.
The median household income in Alum Rock, California is $111,976, with 5.1% of residents living below the federal poverty level.
The median home value in Alum Rock, California is $880,000, with median monthly rent at $2,412 and a homeownership rate of 70.4%.
The median age in Alum Rock, California is 40.3 years. The population is 49.8% male and 50.2% female.
Alum Rock Cdp, CA Climate
Alum Rock Cdp, CA has an average annual temperature of 15.4°C (60°F) and receives about 542 mm of precipitation per year. The warmest month is August and the coldest is January. Figures are 1970–2000 climate normals.
15.4°C
Avg Temp
542
Precip (mm/yr)
Aug
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | 9° / 48° | 111 mm |
| February | 11° / 51° | 88 mm |
| March | 12° / 53° | 84 mm |
| April | 14° / 56° | 40 mm |
| May | 16° / 62° | 7 mm |
| June | 19° / 67° | 3 mm |
| July | 22° / 71° | 2 mm |
| August | 22° / 71° | 3 mm |
| September | 21° / 69° | 8 mm |
| October | 18° / 64° | 30 mm |
| November | 13° / 55° | 82 mm |
| December | 9° / 49° | 84 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Alum Rock Cdp, CA
The most comfortable months to visit Alum Rock Cdp, CA are typically September, July and August, when temperatures are mildest and rainfall is relatively low. The hottest month is August (around 30°C high). The coldest is January (near 4°C low). January is usually the wettest month.
Where to stay near Alum Rock
Visiting or relocating to Alum Rock, CA? Compare hotels and short-term rentals across the metro — live availability and prices.
Top-rated places to stay near Alum Rock
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a move to Alum Rock?
Get relocation and cost-of-living insights for Alum Rock, CA by email. No spam, unsubscribe anytime.
More from California
Population 3,857,897
Population 1,385,061
Population 990,054
Population 836,321
Population 543,615
Full rankings of California cities by population
Statewide data for California
Population, race, income, age, and trends across California
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.