Below is a list of Omaha IL zip codes. For your research we have also included Omaha Area Code, Time Zone, UTC and the local Gallatin County FIPS Code. Each Omaha Illinois zip code has a center Longitude / Latitude point (the Omaha center is -88.302696228027 / 37.890201568604). For your convenience we have also indicated if that zip code in Omaha observes Daylight Savings time.