Below is a list of Holtville CA zip codes. For your research we have also included Holtville Area Code, Time Zone, UTC and the local Imperial County FIPS Code. Each Holtville California zip code has a center Longitude / Latitude point (the Holtville center is -115.37599945068 / 32.811000823975). For your convenience we have also indicated if that zip code in Holtville observes Daylight Savings time.