Below is a list of Lassen County CA zip codes. For your research we have also included Lassen County Area Code, Time Zone, UTC and the local County FIPS Code. Each Lassen County California zip code has a center Longitude / Latitude point (the Lassen County center is -120.53399658203 / 40.511199951172). For your convenience we have also indicated if that zip code in Lassen County observes Daylight Savings time.