Contra Costa County, California Demographics 2026
Contra Costa County, California has a population of 1,165,012, the 9th most populous county in California. The median household income is $127,229 and the median home value is $866,800. The poverty rate is 8.4%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Contra Costa County Quick Facts
How Contra Costa County Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 1,161,458 | 1,165,012 | +0.3% |
| Median household income | $125,727 | $127,229 | +1.2% |
| Median home value | $830,800 | $866,800 | +4.3% |
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
This community is exceptionally diverse, with no single racial or ethnic group dominating the population.
State average: 70 | National average: 61
Education
Educational Attainment (Adults 25+)
Cities & Places in Contra Costa County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Concord | 124,035 | $108,709 | 8.2% | $797,600 |
| Antioch | 116,477 | $97,465 | 11.4% | $629,700 |
| Richmond | 115,505 | $95,391 | 13.6% | $668,200 |
| San Ramon | 85,993 | $196,161 | 4.4% | $1,509,500 |
| Pittsburg | 76,257 | $99,861 | 11.2% | $597,900 |
| Walnut Creek | 70,088 | $130,432 | 6.4% | $1,057,300 |
| Brentwood | 65,208 | $142,494 | 8.3% | $836,600 |
| Oakley | 45,183 | $137,677 | 6.1% | $660,200 |
| Danville | 43,401 | $232,216 | 3.8% | $1,681,700 |
| Martinez | 36,903 | $127,355 | 6.3% | $859,800 |
| Pleasant Hill | 34,235 | $145,029 | 7.3% | $1,077,100 |
| San Pablo | 31,720 | $79,478 | 12.6% | $551,700 |
| Hercules | 26,302 | $129,397 | 5.6% | $769,400 |
| El Cerrito | 25,994 | $127,876 | 6.9% | $1,124,400 |
| Lafayette | 25,285 | $228,250 | 2.9% | $2,000,000+ |
| Bay Point | 24,231 | $82,565 | 14.4% | $525,000 |
| Orinda | 19,514 | $250,000+ | 2.2% | $1,863,200 |
| Pinole | 18,761 | $127,717 | 6.9% | $718,600 |
| Moraga | 16,769 | $216,193 | 7.3% | $1,663,200 |
| El Sobrante (Contra Costa County) | 16,294 | $114,853 | 11.4% | $758,800 |
| Discovery Bay | 14,911 | $147,117 | 7.4% | $832,000 |
| Alamo | 14,488 | $250,000+ | 2.1% | $2,000,000+ |
| Clayton | 10,937 | $175,707 | 2.5% | $1,055,200 |
| Blackhawk | 10,137 | $245,208 | 5.6% | $2,000,000+ |
| Rodeo | 8,976 | $91,484 | 8.4% | $663,200 |
| Contra Costa Centre | 6,893 | $121,313 | 10.1% | $733,300 |
| Camino Tassajara | 5,831 | $250,000+ | 6.5% | $2,000,000+ |
| Saranap | 5,662 | $157,347 | 4.1% | $1,453,300 |
| Kensington | 5,179 | $237,130 | 3.6% | $1,539,000 |
| Tara Hills | 4,840 | $101,747 | 8.6% | $661,200 |
| Pacheco | 4,325 | $101,210 | 13.2% | $343,300 |
| San Miguel (Contra Costa County) | 3,967 | $250,000+ | 1.8% | $1,649,100 |
| North Richmond | 3,855 | $100,673 | 4.5% | $623,900 |
| Rollingwood | 3,627 | $99,830 | 14.7% | $600,000 |
| Vine Hill | 3,540 | $115,313 | 10.3% | $631,900 |
| Crockett | 3,372 | $110,899 | 11.2% | $776,100 |
| Reliez Valley | 3,173 | $249,864 | 5.3% | $1,740,200 |
| East Richmond Heights | 3,109 | $134,632 | 5.3% | $915,400 |
| Bayview (Contra Costa County) | 2,751 | $162,537 | 9.0% | $654,900 |
| Mountain View | 2,418 | $94,046 | 11.0% | $590,100 |
| Knightsen | 2,264 | $177,232 | 3.8% | $953,000 |
| Montalvin Manor | 2,063 | $79,542 | 9.4% | $438,600 |
| Bethel Island | 1,864 | $74,972 | 34.6% | $682,700 |
| Byron | 1,837 | $76,424 | 15.4% | $750,000 |
| Diablo | 1,232 | $248,150 | 13.2% | $2,000,000+ |
| Castle Hill | 1,026 | $250,000+ | 0.2% | $2,000,000+ |
| Norris Canyon | 1,014 | $250,000+ | 1.8% | $2,000,000+ |
| Acalanes Ridge | 1,006 | $181,094 | 1.5% | $1,633,100 |
| Alhambra Valley | 979 | $206,063 | 19.9% | $1,249,100 |
| North Gate | 806 | $208,525 | 4.1% | $1,674,700 |
| Shell Ridge | 746 | $250,000+ | 1.9% | $1,912,000 |
| Clyde | 653 | $134,050 | 6.9% | $649,200 |
| Port Costa | 296 | $38,929 | 0.0% | $600,000 |
Explore California Rankings
Population Overview
Contra Costa County is located in California with a total population of 1,165,012. It is the 9th most populous county out of 58 in California. The county encompasses 53 Census-designated places.
Age Demographics
The median age in Contra Costa County is 40.5 years. This is 7% higher than the state median of 37.9 years.
Economy, Income & Housing
The median household income in Contra Costa County is $127,229. This is 28% higher than the state median of $99,122. It is also 58% higher than the national median of $80,734. The poverty rate stands at 8.4%. This is 30% lower than the state poverty rate of 12.0%. The unemployment rate is 6.5%. This is 2% lower than the state rate of 6.6%. The median home value is $866,800. Housing costs are 18% higher than the state median of $734,700. The home-value-to-income ratio of 6.8x suggests that housing affordability is a significant concern for many residents. 68.0% of occupied housing units are owner-occupied. This homeownership rate is 22% higher than the state average of 55.9%.
Race & Ethnicity
Contra Costa County is a highly diverse community where no single racial or ethnic group constitutes a majority of the population. Hispanic or Latino residents account for 27.6%. The Black or African American population is significantly higher than the state average (8.0% vs 5.2%).
Education
45.2% of residents aged 25 and older hold a bachelor's degree or higher. This places Contra Costa County in the top 10% of all counties in the state for educational attainment. This is 22% higher than the state rate of 37.1%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 89.6%. Notably, 17.7% of adults hold a graduate or professional degree, indicating a highly educated workforce.
Data Sources & Methodology
All figures for Contra Costa County come from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates, with comparisons drawn against California and national averages from the same dataset. See our methodology page for how each metric is defined, or data.census.gov for official tables with margins of error.
Frequently Asked Questions
What is the population of Contra Costa County, California?
Contra Costa County has a population of 1,165,012, making it the 9th most populous county in California.
What is the median income in Contra Costa County?
The median household income in Contra Costa County is $127,229 with a poverty rate of 8.4%.
How many cities are in Contra Costa County, California?
Contra Costa County contains 53 Census-designated places.