Below is a list of Humboldt County CA zip codes. For your research we have also included Humboldt County Area Code, Time Zone, UTC and the local County FIPS Code. Each Humboldt County California zip code has a center Longitude / Latitude point (the Humboldt County center is -123.98000335693 / 40.614498138428). For your convenience we have also indicated if that zip code in Humboldt County observes Daylight Savings time.