Below is a list of San Marcos CA zip codes. For your research we have also included San Marcos Area Code, Time Zone, UTC and the local San Diego County FIPS Code. Each San Marcos California zip code has a center Longitude / Latitude point (the San Marcos center is -117.17600250244 / 33.137798309326). For your convenience we have also indicated if that zip code in San Marcos observes Daylight Savings time.