Contra Costa County

About Contra Costa County

The County of Contra Costa is home to approximately 1,094,000 residents and was incorporated in 1850 as one of the original 27 counties of the State of California. It is one of the nine counties in the San Francisco-Oakland Bay Area. The County is the ninth most populous county in California. Contra Costa County is dedicated to providing public services which improve the quality of life of our residents and the economic viability of business.