Contra Costa County, California
Contra Costa County is a county in California with an estimated population of 1,155,025 in 2023. 19 cities, towns and Census places in it are indexed here.
Largest places in Contra Costa County
Concord 122,315Antioch 117,096Richmond 114,106San Ramon 84,929Pittsburg 75,803Walnut Creek 69,152Brentwood 65,126Oakley 45,761Danville 42,999Martinez 36,395Pleasant Hill 33,802San Pablo 31,249Hercules 26,582El Cerrito 25,552Lafayette 25,048Orinda 19,364Pinole 18,481Moraga 16,547Clayton 10,754
About Contra Costa County
Contra Costa County is one of the counties of California. County governments in California handle local services such as courts, property records and elections; cities and towns inside the county run their own municipal services. Population figures come from the Census Bureau's Vintage 2023 estimates, which are updated annually.