Below is a list of San Joaquin County CA zip codes. For your research we have also included San Joaquin County Area Code, Time Zone, UTC and the local County FIPS Code. Each San Joaquin County California zip code has a center Longitude / Latitude point (the San Joaquin County center is -121.28900146484 / 37.958801269531). For your convenience we have also indicated if that zip code in San Joaquin County observes Daylight Savings time.