Below is a list of Rio Oso CA zip codes. For your research we have also included Rio Oso Area Code, Time Zone, UTC and the local Sutter County FIPS Code. Each Rio Oso California zip code has a center Longitude / Latitude point (the Rio Oso center is -121.54299926758 / 38.961101531982). For your convenience we have also indicated if that zip code in Rio Oso observes Daylight Savings time.