Below is a list of Harmon IL zip codes. For your research we have also included Harmon Area Code, Time Zone, UTC and the local Lee County FIPS Code. Each Harmon Illinois zip code has a center Longitude / Latitude point (the Harmon center is -89.55460357666 / 41.722301483154). For your convenience we have also indicated if that zip code in Harmon observes Daylight Savings time.