Below is a list of Iroquois IL zip codes. For your research we have also included Iroquois Area Code, Time Zone, UTC and the local Iroquois County FIPS Code. Each Iroquois Illinois zip code has a center Longitude / Latitude point (the Iroquois center is -87.581703186035 / 40.828300476074). For your convenience we have also indicated if that zip code in Iroquois observes Daylight Savings time.