County · California
Contra Costa County, California
Contra Costa County, California. Contra Costa County had 1,170,070 residents in 2025 by the Census Bureau's estimate, up 0.3% since 2020, while California shrank 0.5%. It holds 53 places (19 cities, villages and boroughs and 34 census-designated) and 242 census tracts. GEOID 06013.
Contra Costa County is one of the 5 counties of the San Francisco-Oakland-Fremont, CA metropolitan statistical area (the Census Bureau's July 2023 delineation).
Residents, July 2025 estimate
1,170,070
Census Bureau estimate (no margin published)
2020 Census count: 1,165,927 · ACS 2020-2024: 1,165,012
Median household income
$127,229
±$1,713 (90% margin)
California: $99,122
Median home value
$866,800
±$6,426 (90% margin)
California: $734,700
Median gross rent
$2,375
±$22 (90% margin)
California: $2,036
How many people live in Contra Costa County, and is it growing?
The 2020 Census counted 1,165,927 residents in Contra Costa County. The Census Bureau estimates 1,170,070 for July 1, 2025, up 0.3% since 2020, while California shrank 0.5%. The 2020-2024 American Community Survey puts the population at 1,165,012 over 717 square miles of land.
| Measure | Contra Costa County | California | Change since 2015-2019 |
|---|---|---|---|
| Total population | 1,165,012 | 39,287,377 | +22,761 |
| Households | 414,417±1,118 | 13,548,091 | +19,648 |
| Average household size | 2.78±0.01 | 2.84 | −0.09 |
| Housing units | 429,260±163 | 14,644,735 | +15,541 |
Contra Costa County's population since 2000
From 948,816 in 2000 to 1,170,070 in 2025: up 23.3%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov
What cities and towns are in Contra Costa County?
Contra Costa County holds 53 places: 19 cities, villages and boroughs (incorporated places) and 34 census-designated places. The largest is Concord with 123,261 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.
| Concord | 125,410 | $108,709 |
|---|---|---|
| Richmond | 116,448 | $95,391 |
| Antioch | 115,291 | $97,465 |
| San Ramon | 84,605 | $196,161 |
| Pittsburg | 76,416 | $99,861 |
| Walnut Creek | 70,127 | $130,432 |
| Brentwood | 64,292 | $142,494 |
| Danville | 43,582 | $232,216 |
| Oakley | 43,357 | $137,677 |
| Martinez | 37,287 | $127,355 |
| Pleasant Hill | 34,613 | $145,029 |
| San Pablo | 32,127 | $79,478 |
| Hercules | 26,016 | $129,397 |
| El Cerrito, Contra Costa County | 25,962 | $127,876 |
| Lafayette | 25,391 | $228,250 |
| Bay Point | 23,896 | $82,565 |
| Orinda | 19,514 | $250,000 or more |
| Pinole | 19,022 | $127,717 |
| Moraga | 16,870 | $216,193 |
| El Sobrante (Contra Costa County) | 15,524 | $114,853 |
| Discovery Bay | 15,358 | $147,117 |
| Alamo | 15,314 | $250,000 or more |
| Clayton | 11,070 | $175,707 |
| Rodeo | 9,653 | $91,484 |
| Blackhawk | 9,637 | $245,208 |
| Contra Costa Centre | 6,808 | $121,313 |
| Saranap | 5,830 | $157,347 |
| Kensington | 5,428 | $237,130 |
| Tara Hills | 5,364 | $101,747 |
| Camino Tassajara | 4,951 | $250,000 or more |
| Vine Hill | 4,323 | $115,313 |
| Pacheco | 4,183 | $101,210 |
| North Richmond | 4,175 | $100,673 |
| San Miguel (Contra Costa County) | 3,591 | $250,000 or more |
| East Richmond Heights | 3,460 | $134,632 |
| Reliez Valley | 3,354 | $249,864 |
| Crockett | 3,242 | $110,899 |
| Montalvin Manor | 3,099 | $79,542 |
| Rollingwood | 3,015 | $99,830 |
| Mountain View, Contra Costa County | 2,622 | $94,046 |
| Bethel IslandGEOID 0606210 | 2,131 | $74,972 |
| Bayview (Contra Costa County) | 1,782 | $162,537 |
| Knightsen | 1,596 | $177,232 |
| Norris CanyonGEOID 0651622 | 1,313 | $250,000 or more |
| Acalanes RidgeGEOID 0600135 | 1,285 | $181,094 |
| Castle HillGEOID 0611915 | 1,271 | $250,000 or more |
| DiabloGEOID 0619150 | 1,255 | $248,150 |
| Byron | 1,140 | $76,424 |
| Shell RidgeGEOID 0671362 | 1,014 | $250,000 or more |
| Alhambra ValleyGEOID 0600898 | 805 | $206,063 |
| ClydeGEOID 0614232 | 729 | $134,050 |
| North GateGEOID 0651890 | 667 | $208,525 |
| Port CostaGEOID 0658226 | 190 | $38,929 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov
Who lives in Contra Costa County?
The median resident of Contra Costa County is 40.5 years old; 22.0% are under 18 and 17.1% are 65 or older. The largest group is non-Hispanic white residents at 38.1%, then Hispanic or Latino residents (of any race) at 27.6%. 26.6% of residents were born outside the United States.
| Measure | Contra Costa County | California | Change since 2015-2019 |
|---|---|---|---|
| Median age | 40.5±0.1 | 37.9 | +0.8 |
| Under 18 years | 22.0% | 22.0% | – |
| 65 years and over | 17.1% | 15.7% | – |
| Hispanic or Latino (any race) | 27.6% | 40.2% | +2.0 pts |
| White alone, not Hispanic | 38.1%±0.2 pts | 33.8% | −5.7 pts |
| Black or African American alone, not Hispanic | 7.9%±0.1 pts | 5.2% | −0.5 pts |
| Asian alone, not Hispanic | 18.6%±0.2 pts | 15.3% | +2.1 pts |
| American Indian and Alaska Native alone, not Hispanic | 0.2%±0.1 pts | 0.3% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.5%±0.1 pts | 0.3% | – |
| Two or more races, not Hispanic | 6.3%±0.3 pts | 4.4% | – |
| Some other race alone, not Hispanic | 0.8%±0.1 pts | 0.6% | – |
| Born outside the United States | 26.6%±0.4 pts | 27.0% | +1.2 pts |
| Speak a language other than English at home (age 5+) | 37.5%±0.5 pts | 44.4% | – |
| Civilian veterans (age 18+) | 4.2%±0.2 pts | 4.3% | – |
| With a disability | 11.1%±0.3 pts | 11.6% | – |
| No health insurance coverage | 4.6%±0.3 pts | 6.6% | −0.5 pts |
| High school graduate or higher (age 25+) | 89.6%±0.3 pts | 84.7% | – |
| Bachelor's degree or higher (age 25+) | 45.2%±0.5 pts | 37.1% | +2.8 pts |
| Graduate or professional degree (age 25+) | 17.7%±0.3 pts | 14.4% | – |
| Moved from another state in the past year | 0.9%±0.1 pts | 1.1% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Contra Costa County earn?
Half of Contra Costa County's 414,417 households earn less than $127,229 a year (±$1,713), against $99,122 in California. In 2015-2019 the median was $122,720 in 2024 dollars, so it rose by $4,509 after inflation. 8.4% of residents live below the poverty line.
| Measure | Contra Costa County | California | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $127,229±$1,713 | $99,122 | +$4,509 |
| Mean household income | $174,872±$2,032 | $140,436 | – |
| Per capita income | $62,927±$732 | $49,513 | +$3,635 |
| People below the poverty line | 8.4%±0.4 pts | 12.0% | no clear change |
| Children under 18 below the poverty line | 10.0%±0.9 pts | 15.0% | no clear change |
| Households receiving SNAP | 8.5%±0.3 pts | 12.4% | – |
| Households with a broadband subscription | 95.6%±0.3 pts | 93.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Contra Costa County?
Owners occupy 68.0% of Contra Costa County's occupied homes and renters 32.0%. The median owner-occupied home is valued at $866,800 by its owner (±$6,426). The median renter pays $2,375 a month including utilities, and 47.4% of renters pay 35% or more of their income on rent.
| Measure | Contra Costa County | California | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $866,800±$6,426 | $734,700 | +$96,632 |
| Median gross rent | $2,375±$22 | $2,036 | +$136 |
| Renters paying 35% or more of income on rent | 47.4%±1.2 pts | 46.0% | +3.9 pts |
| Median monthly owner costs, with a mortgage | $3,435±$32 | $2,946 | – |
| Owner-occupied homes | 68.0%±0.5 pts | 55.9% | +2.1 pts |
| Housing units | 429,260±163 | 14,644,735 | +15,541 |
| Homeowner vacancy rate | 0.7%±0.2 pts | 0.8% | – |
| Rental vacancy rate | 2.8%±0.5 pts | 4.2% | – |
| Single-family detached homes | 67.5%±0.5 pts | 57.0% | – |
| Mobile homes | 1.4%±0.1 pts | 3.5% | – |
| Built 2020 or later | 1.1%±0.1 pts | 1.3% | – |
| Built 1939 or earlier | 4.2%±0.2 pts | 8.9% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Contra Costa County building?
Builders took permits for 1,163 new housing units across Contra Costa County in 2025 (970 single-family), 1.0 per 1,000 residents.
Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Contra Costa County get to work?
59.7% of Contra Costa County's workers drive alone and 21.3% work from home. The average trip to work takes 35.3 minutes. The unemployment rate in 2020-2024 averaged 6.5%.
| Measure | Contra Costa County | California | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 64.7%±0.4 pts | 63.8% | – |
| Unemployment rate | 6.5%±0.3 pts | 6.6% | +1.2 pts |
| Drove alone to work | 59.7%±0.7 pts | 65.7% | – |
| Carpooled | 10.0%±0.5 pts | 9.5% | – |
| Public transportation | 5.4%±0.3 pts | 2.9% | – |
| Walked | 1.8%±0.2 pts | 2.4% | – |
| Worked from home | 21.3%±0.5 pts | 17.2% | +14.7 pts |
| Mean travel time to work | 35.3 min±0.4 | 28.7 min | −3.4 min |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What are Contra Costa County's census tracts?
Contra Costa County is divided into 242 census tracts. Among those with a reliable estimate, median household income runs from $49,837 (Tract 3770) to $250,000 or more (Tract 3920).
All 242 census tracts of Contra Costa County, with their figures
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov
How does Contra Costa County compare with California's other counties?
| Measure | Rank |
|---|---|
| Population | 9th of 58 |
| Growth 2020-2025 | 21st of 58 |
| Residents per square mile | 7th of 58 |
| Median household income | 6th of 58 |
| Median home value | 9th of 58 |
| Median gross rent | 6th of 56 |
| Poverty rate | 50th of 57 |
| Bachelor's degree or higher | 6th of 58 |
| Median age | 22nd of 58 |
Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Contra Costa County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.