Contra Costa, named "opposite coast" for its location across from San Francisco and Marin, is one of California's original 27 counties and the 9th most populous county in California.  

Home to Mt. Diablo, the tallest peak in the Bay area, Contra Costa includes 732.6 square miles of land and 73.3 square miles of Bay and Delta waters.

The area is rich in history and offers visitors a wealth of places to visit, things to do and outdoor recreational opportunities.