Below is a list of Decatur IN zip codes. For your research we have also included Decatur Area Code, Time Zone, UTC and the local Adams County FIPS Code. Each Decatur Indiana zip code has a center Longitude / Latitude point (the Decatur center is -84.924301147461 / 40.831401824951). For your convenience we have also indicated if that zip code in Decatur observes Daylight Savings time.