Below is a list of Antioch CA zip codes. For your research we have also included Antioch Area Code, Time Zone, UTC and the local Contra Costa County FIPS Code. Each Antioch California zip code has a center Longitude / Latitude point (the Antioch center is -121.80500030518 / 37.981098175049). For your convenience we have also indicated if that zip code in Antioch observes Daylight Savings time.