Castro Valley, California Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Castro Valley, California is 65,389 as of the 2023 American Community Survey, making it the 140th-largest city in California. The median household income is $138,069, the median home value is $1,058,200, and the median age is 42.8.
65,389
Population
3881
People / sq mi
$138,069
Median Income
$1,058,200
Median Home Value
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Castro Valley covers 16.8 sq mi of land at 3881 people per square mile.
About Castro Valley, CA
Housing cost is the defining feature of Castro Valley: the median home is valued at $1,058,200. With 65,389 residents, Castro Valley is a city in California.
Households here are among the highest-earning of all US cities: median income is $138,069, above the US median of $78,538. The poverty rate is 4.8%, below the national 12.4%. Housing is expensive: the median home is worth $1,058,200, with typical rent around $2,499.
College attainment is above the local norm at 43.9%, above the national 35.0%. A solid 18.4% of workers are based at home, above the national 14.0%, and the average commute runs about 34 minutes each way.
High housing values reframe the income picture in Castro Valley — even solid earnings stretch less against home prices and rents at this level.
Race & Ethnicity
| White | 38.3% |
| Black or African American | 8.7% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 2.0% |
| Two or More Races | 0.0% |
Economy & Income
$138,069
Median Household Income
$58,843
Per Capita Income
4.8%
Poverty Rate
2.4%
Unemployment Rate
Housing
$1,058,200
Median Home Value
$2,499
Median Rent
71.5%
Owner-Occupied
Education
90.4%
High School+
43.9%
Bachelor's+
Commute
5.9%
Drive Alone
65.7%
Public Transit
18.4%
Work From Home
33.6 min
Avg Commute
Community Profile
11.5%
Foreign Born
58.5%
Non-English at Home
4.3%
Veterans
8.8%
With Disability
95.8%
Health Insurance
97.3%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 25.2% |
| Finance, Insurance & Real Estate | 15.8% |
| Manufacturing | 8.2% |
| Construction | 6.9% |
| Information | 6.6% |
| Retail Trade | 6.4% |
| Education, Health Care & Social Services | 5.5% |
| Public Administration | 5.2% |
| Arts, Entertainment & Food Services | 3.8% |
| Transportation & Warehousing | 3.7% |
| Agriculture & Mining | 0.2% |
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Frequently Asked Questions
Castro Valley, California has a population of 65,389 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 140th-largest city in California.
The median household income in Castro Valley, California is $138,069, with 4.8% of residents living below the federal poverty level.
The median home value in Castro Valley, California is $1,058,200, with median monthly rent at $2,499 and a homeownership rate of 71.5%.
The median age in Castro Valley, California is 42.8 years. The population is 48.7% male and 51.3% female.
Castro Valley Cdp, CA Climate
Castro Valley Cdp, CA has an average annual temperature of 15°C (59°F) and receives about 509 mm of precipitation per year. The warmest month is August and the coldest is January. Figures are 1970–2000 climate normals.
15°C
Avg Temp
509
Precip (mm/yr)
Aug
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | 9° / 49° | 104 mm |
| February | 11° / 52° | 88 mm |
| March | 12° / 54° | 80 mm |
| April | 14° / 57° | 33 mm |
| May | 16° / 61° | 11 mm |
| June | 18° / 65° | 3 mm |
| July | 20° / 68° | 1 mm |
| August | 20° / 68° | 3 mm |
| September | 20° / 68° | 7 mm |
| October | 17° / 63° | 31 mm |
| November | 13° / 55° | 72 mm |
| December | 9° / 49° | 76 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 Castro Valley Cdp, CA
The most comfortable months to visit Castro Valley Cdp, CA are typically August, July and September, when temperatures are mildest and rainfall is relatively low. The hottest month is August (around 27°C high). The coldest is January (near 5°C low). January is usually the wettest month.
Where to stay near Castro Valley
Visiting or relocating to Castro Valley, CA? Compare hotels and short-term rentals across the metro — live availability and prices.
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.