Contra Costa County is a county in the state of California in the United States. As of the 2010 census, the population was 1,049,025. The county seat is Martinez. It occupies the northern portion of the East Bay region of the San Francisco Bay Area, and is primarily suburban. Area: 1,854 km² Largest city: Concord (population and land area); Richmond (total area) Population: 1.147 million (2017) Destinations: Tilden Regional Park, Walnut Creek, Richmond, Points of interest: Mount Diablo, Mount Diablo State Park,

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