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Contra Costa County, California
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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. The county seat is Martinez. It is in the northern part of the San Francisco Bay Area region.
- "State & County QuickFacts". United States Census Bureau. http://quickfacts.census.gov/qfd/states/06/06013.html. Retrieved April 3, 2016.
- "Find a County". National Association of Counties. Archived from the original on May 31, 2011. https://web.archive.org/web/20110531210815/http://www.naco.org/Counties/Pages/FindACounty.aspx. Retrieved 2011-06-07.