Below is a list of Yountville CA zip codes. For your research we have also included Yountville Area Code, Time Zone, UTC and the local Napa County FIPS Code. Each Yountville California zip code has a center Longitude / Latitude point (the Yountville center is -122.36000061035 / 38.40119934082). For your convenience we have also indicated if that zip code in Yountville observes Daylight Savings time.