Below is a list of Niantic IL zip codes. For your research we have also included Niantic Area Code, Time Zone, UTC and the local Macon County FIPS Code. Each Niantic Illinois zip code has a center Longitude / Latitude point (the Niantic center is -89.161102294922 / 39.853401184082). For your convenience we have also indicated if that zip code in Niantic observes Daylight Savings time.