Below is a list of Angwin CA zip codes. For your research we have also included Angwin Area Code, Time Zone, UTC and the local Napa County FIPS Code. Each Angwin California zip code has a center Longitude / Latitude point (the Angwin center is -122.446 / 38.5759). For your convenience we have also indicated if that zip code in Angwin observes Daylight Savings time. For more information on Angwin California you will find helpful business links and searches.