Contra Costa County, California

county in California, United States

Contra Costa County is a county in the state of California. It is in the United States. As of the 2020 census, the population was 1,165,927.[1] The county seat is Martinez.[2] It is in the eastern part of the San Francisco Bay Area region.

The location of Contra Costa County in the state of California.
Seal of Contra Costa County
Seal of Contra Costa County

References

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  1. "QuickFacts: Contra Costa County, California". U.S. Census Bureau. Retrieved May 10, 2023.
  2. "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved 2011-06-07.