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Contra Costa County - Area Map
About Contra Costa County

The County of Contra Costa, California (the "County") was incorporated in 1850 as one of the original 27 counties of the State of California (the "State"), with the City of Martinez as the County Seat. It is one of the nine counties in the San Francisco-Oakland Bay Area. The County is the ninth most populous county in California, with its population reaching approximately 1,066,096 as of January 1, 2011. 

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Special Saturday Hours at the Elections Office Coming on November 3 Voters who want to pick up or drop off a ballot, or cast their vote in person, may do so on Saturday, November 3. The Elections Office at 555 Escobar Street in Martinez will be open from 9:00 a.m. until 3:00 p.m. Call 925-335-7800 or go online for info: Elections Website

Interested in Serving on the East Bay Regional Park District's Park Advisory Committee? The Board of Supervisors is looking for applicants to serve on the committee that helps shape the master plan for the District. The Park District covers more than 112,000 acres of land in Contra Costa and Alameda Counties. Apply by December 3, 2012. Additional Info...

October Designated "Creek and Channel Safety Awareness Month" Recognizing the need to share information with the community about the potential dangers of using flood control channels for recreation, the Board of Supervisors proclaimed October as Creek and Channel Safety Awareness Month. Find out more in the Media Advisory

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