Below is a list of Rio Dell CA zip codes. For your research we have also included Rio Dell Area Code, Time Zone, UTC and the local Humboldt County FIPS Code. Each Rio Dell California zip code has a center Longitude / Latitude point (the Rio Dell center is -124.10600280762 / 40.499801635742). For your convenience we have also indicated if that zip code in Rio Dell observes Daylight Savings time.