Below is a list of Gilman IL zip codes. For your research we have also included Gilman Area Code, Time Zone, UTC and the local Iroquois County FIPS Code. Each Gilman Illinois zip code has a center Longitude / Latitude point (the Gilman center is -87.994201660156 / 40.762901306152). For your convenience we have also indicated if that zip code in Gilman observes Daylight Savings time.