Welcome to Martinez - Contra Costa County Seat

Martinez is a city in and the county seat of Contra Costa County, California, in the East Bay of the San Francisco Bay Area. The population was 35,824 at the 2010 census. The downtown is notable for its large number of preserved old buildings and antique shops.

Area Listings

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Updated: 13th May, 2021 12:16 PM (UTC).

Updated: 13th May, 2021 10:47 AM (UTC).