Below is a list of Onarga IL zip codes. For your research we have also included Onarga Area Code, Time Zone, UTC and the local Iroquois County FIPS Code. Each Onarga Illinois zip code has a center Longitude / Latitude point (the Onarga center is -88.013496398926 / 40.715301513672). For your convenience we have also indicated if that zip code in Onarga observes Daylight Savings time.