Antioch,_California | isPartOf | California California | language | English_language United_States_House_of_Representatives | isPartOf | United_States_Congress Antioch,_California | isPartOf | Contra_Costa_County,_California Antioch,_California | leaderTitle | United_States_House_of_Representatives
California uses the spoken language of English and is the location of Antioch. The city is part of Contra Costa County and is led by the United States House of Representatives (part of the United States Congress).