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Contra Costa County (/ ˌ k ɒ n t r ə ˈ k ɒ s t ə / ⓘ; Contra Costa, Spanish for 'Opposite Coast') is a county located in the U.S. state of California, in the East Bay of the San Francisco Bay Area. As of the 2020 United States Census, the population was 1,165,927. [6] The county seat is Martinez.
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Lying across the Bay Bridge from San Francisco, the East Bay consists primarily of Contra Costa County and Alameda County. It has a unique culture that's more laid back and uncomplicated than its western neighbors.
Contra Costa County is home to 19 cities and numerous unincorporated communities. See the County Supervisorial Districts map. For more information about local cities, visit the links below.
Contra Costa County, CA borders Alameda County, CA, Marin County, CA, Sacramento County, CA, San Francisco County, CA, San Joaquin County, CA, Solano County, CA, and Sonoma County, CA. Photo by Images by John 'K'
2020 County Population: 1,165,927. Contra Costa County saw an increase of 116,902 people (10% increase) Source: 2020 Decennial Census. 2020 City Population and Growth Rate
Mostly east of the Oakland Hills that border the East Bay, Contra Costa County maintains a very separate culture and lifestyle than its Bay Area neighbors. The area is mostly residential -- although many San Francisco businesses have moved here to avoid high city taxes -- and affluent, and consequently considerably more conservative (by Bay ...
