Contra Costa County is the ninth most populous county in California, with its population reaching approximately 930,000 as of January 1, 2000. The county of Contra Costa, California was incorporated in 1850 as one of the original 27 counties of the state of California, 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 has one of the fastest growing work forces among Bay Area counties, with growth in its employment base being driven primarily by the need to provide services to an increasing local population.
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