About Contra Costa County, California

Contra Costa County
Image courtesy of Wikipedia

Contra Costa County, California, is a county located in the East Bay of the San Francisco Bay Area, with an estimated population of 1,212,687 as of the 2024 United States Census. The county seat is Martinez. It is home to 19 cities and numerous unincorporated communities. Some notable landmarks in the county include Mount Diablo, rising 3,849 feet at the northern end of the Diablo Range, and the East Bay Regional Park District, which comprises more than 100,000 acres within 65 parks, including more than 1,200 miles of trails.

The county was one of the original 27 counties established in California in 1850. It is the ninth most populous county in the state. The county’s name refers to its position on the other side of the bay from San Francisco. The county’s physical geography is dominated by the bayside alluvial plain, the Oakland Hills–Berkeley Hills, and the Diablo Range.

Contra Costa County is known for its high-quality public schools, with Dougherty Valley High School, Monte Vista High School, and Middle College High School being highly rated. The median home value in the county is $689,000, and the median rent is $2,061. The county is home to many bars, restaurants, coffee shops, and parks, and residents tend to be liberal.