Antioch,_California | isPartOf | Contra_Costa_County,_California Antioch,_California | isPartOf | California California | language | English_language Antioch,_California | areaTotal | 75.324 (square kilometres) Contra_Costa_County,_California | isPartOf | San_Francisco_Bay_Area
Antioch is part of Contra Costa County (part of the San Francisco Bay Area) in California and has a total area of 75.324 sq km. The language spoken in California is English.