Cities & Communities of Contra Costa Antioch. Brentwood. Clayton. Concord. Town of Danville. El Cerrito. Hercules. Lafayette. Martinez. Town of Moraga. Oakley. Orinda. Pinole. Pittsburg. Pleasant Hill. Richmond. San Pablo. San Ramon. Walnut Creek.
Contra Costa County is broadly divided into three sub-areas: West County, including of the cities of El Cerrito, Richmond, San Pablo, Pinole, and Hercules, as well as the unincorporated communities of Kensington, El Sobrante, North Richmond, Rodeo, Crockett, and Port Costa.