Below is a list of Duncans Mills CA zip codes. For your research we have also included Duncans Mills Area Code, Time Zone, UTC and the local Sonoma County FIPS Code. Each Duncans Mills California zip code has a center Longitude / Latitude point (the Duncans Mills center is -123.05400085449 / 38.453399658203). For your convenience we have also indicated if that zip code in Duncans Mills observes Daylight Savings time.