94509 is zip code located in Antioch, California. The population is 61,665, making 94509 the largest zipcode in Antioch and the 2nd largest in Contra Costa County.
There are 18 public schools in 94509 with an average Homefacts rating of C-. The total crime rate for Antioch is high , and there are 146 registered sex offenders residing in the zip code 94509. Unemployment in 94509 is very high.
Zip codes within Antioch include 94531.