Contra Costa County, California

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Contra Costa is a county in California. It was formed in 1850 from the following county/ies: original. Contra Costa began keeping birth records in 1850, marriage records in 1850, and death records in 1850. It began keeping land records in 1850, probate records in 1850, and court records in 1850. For more information, contact the county at 651 Pine St. Rm 106, Martinez 94553-1229. On the attached map, Contra Costa is located at D6.


For information about the state of California see California Family History Research.

The Counties and County Seats of California


Counties of California
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AlamedaAlpineAmadorButteCalaverasColusaContra CostaDel NorteEl DoradoFresnoGlennHumboldtImperialInyoKernKingsLakeLassenLos AngelesMaderaMarinMariposaMendocinoMercedModocMonoMontereyNapaNevadaOrangePlacerPlumasRiversideSacramentoSan BenitoSan BernardinoSan DiegoSan FranciscoSan JoaquinSan Luis ObispoSan MateoSanta BarbaraSanta ClaraSanta CruzShastaSierraSiskiyouSolanoSonomaStanislausSutterTehamaTrinityTulareTuolumneVenturaYoloYuba