Below is a list of Hardin IL zip codes. For your research we have also included Hardin Area Code, Time Zone, UTC and the local Calhoun County FIPS Code. Each Hardin Illinois zip code has a center Longitude / Latitude point (the Hardin center is -90.615798950195 / 39.160301208496). For your convenience we have also indicated if that zip code in Hardin observes Daylight Savings time.