Below is a list of Napa County CA zip codes. For your research we have also included Napa County Area Code, Time Zone, UTC and the local County FIPS Code. Each Napa County California zip code has a center Longitude / Latitude point (the Napa County center is -122.38500213623 / 38.434700012207). For your convenience we have also indicated if that zip code in Napa County observes Daylight Savings time.