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Contra Costa
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The follwing places are located in the county of Contra Costa.
Contra Costa
Port Costa
Sand Hill
Valona
Byron
Avon
Los Medanos
Orwood
McAvoy
Stewartville
West Hartley
Cornwall
Diamond
Somersville
Tassajara
Saranap
Walnut Heights
Brentwood
Clayton
Crockett
Danville
El Cerrito
Lafayette
Martinez
Oakley
Pinole