EntityQ1018596· pop 30· linked from 273 articlesByronSign in to savecensus designated place in Contra Costa County, California, United StatesConnectionscensus-designated place in the United StatesEntitySan Mateo CountyEntityUnited States Census BureauEntityunincorporated areaEntityPacific Time ZoneEntity2000 United States CensusEntityBlackhawkEntityWorld War IIConceptCaliforniaEntitySan FranciscoEntitytime zoneEntitygeographic coordinate systemEntityInternational Standard Book NumberEntitySan JoseEntityDemocratic Party (United States)ConceptGreat DepressionEntityU.S. stateEntityOaklandEntityDaylight saving timeConceptendangered speciesEntityCategories1878 establishments in CaliforniaCensus-designated places in CaliforniaCensus-designated places in Contra Costa County, CaliforniaPopulated places in the United States established in 1878