antioch,_california | ispartof | contra_costa_county,_california <tsp> antioch,_california | ispartof | california <tsp> california | language | english_language <tsp> antioch,_california | areatotal | 75324 (square kilometres) <tsp> contra_costa_county,_california | ispartof | san_francisco_bay_area <sep> antioch is the third-largest city in contra costa county, california, united states the city is located in the east bay region of the san francisco bay area along the sacramento–san joaquin river delta the city's population was 115,291 at the 2020 census the city has grown substantially more diverse since the 1970s 
antioch. contra costa county. in the san francisco bay area. is part of english speaking. california. united states. antioch has an area of 75.3242 sq km.antioch is located in the east bay region of the san francisco bay area