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Contra Costa County, California

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

Contra Costa County is a county in the state of California. It is in the United States. As of the 2010 census, the population was 1,049,025.[1] The county seat is Martinez.[2] It is in the northern part of the San Francisco Bay Area region.


  1. "State & County QuickFacts". United States Census Bureau. Retrieved April 3, 2016. 
  2. "Find a County". National Association of Counties. Archived from the original on May 31, 2011. Retrieved 2011-06-07.