Below is a list of Oakville CA zip codes. For your research we have also included Oakville Area Code, Time Zone, UTC and the local Napa County FIPS Code. Each Oakville California zip code has a center Longitude / Latitude point (the Oakville center is -122.40200042725 / 38.429500579834). For your convenience we have also indicated if that zip code in Oakville observes Daylight Savings time.