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Contra Costa County, California
Contra Costa County runs from the Richmond and Martinez refinery shoreline through the Diablo Valley suburbs to the Delta towns of Antioch, Pittsburg and Brentwood. Growth has pushed steadily east along Highway 4 into the county's last large greenfield sites, with the voter-approved Urban Limit Line, Delta levee and flood constraints, and refinery-transition planning shaping where the next decade of housing lands.
Open the live Contra Costa County map →
Contra Costa County at a glance
- 1,173,000Population (2024)
- MartinezCounty seat
- 717 sq miLand area
- 1,636 / sq miDensity
- $126,000Median household income
- $830,000Median home value
What the live Contra Costa County map shows
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- City Boundaries: 19
- School Boundaries: 19
- Congressional Districts: 3
- Soils: 136
- State House Districts: 4
- State Senate Districts: 3
- Voter Precincts: 1,168
- Wetlands: 7
- Development News: 1
Cities and towns in Contra Costa County
Antioch, Brentwood, Clayton, Concord, Danville, El Cerrito, Hercules, Lafayette, Martinez, Moraga, Oakley, Orinda, Pinole, Pittsburg, Pleasant Hill, Richmond, San Pablo, San Ramon, Walnut Creek.
Neighboring counties
- Alameda County, CA · map
- Solano County, CA · map
- San Joaquin County, CA · map
- Marin County, CA · map
- Sacramento County, CA · map