antioch,_california | populationtotal | 102372 <tsp> antioch,_california | utcoffset | -8 <tsp> antioch,_california | areacode | 925 <tsp> antioch,_california | areatotal | 75324 (square kilometres) <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 
the population of antioch. california is 102372 and the utc offset is -8. antioch has the area code 925 and its total area is 75.324 square km.no information