Below is a list of Grand River IA zip codes. For your research we have also included Grand River Area Code, Time Zone, UTC and the local Decatur County FIPS Code. Each Grand River Iowa zip code has a center Longitude / Latitude point (the Grand River center is -93.963600158691 / 40.818500518799). For your convenience we have also indicated if that zip code in Grand River observes Daylight Savings time.