antioch,_california | utcoffset | -7 <tsp> antioch,_california | areacode | 925 <tsp> antioch,_california | populationtotal | 102372 <tsp> antioch,_california | postalcode | 94509, 94531 <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 
some information about antioch. california are as follows: its utc offset is -7. the area code is 925. and it has the post codes 94509 and 94531. antioch's population is 102372. and the total area of the city is 75.324 square kilometres. <sep> no information