Below is a list of Decatur IA zip codes. For your research we have also included Decatur Area Code, Time Zone, UTC and the local Decatur County FIPS Code. Each Decatur Iowa zip code has a center Longitude / Latitude point (the Decatur center is -93.833702087402 / 40.739498138428). For your convenience we have also indicated if that zip code in Decatur observes Daylight Savings time.