Below is a list of Monte Rio CA zip codes. For your research we have also included Monte Rio Area Code, Time Zone, UTC and the local Sonoma County FIPS Code. Each Monte Rio California zip code has a center Longitude / Latitude point (the Monte Rio center is -123.01100158691 / 38.468101501465). For your convenience we have also indicated if that zip code in Monte Rio observes Daylight Savings time.