Below is a list of Mcdonough County IL zip codes. For your research we have also included Mcdonough County Area Code, Time Zone, UTC and the local County FIPS Code. Each Mcdonough County Illinois zip code has a center Longitude / Latitude point (the Mcdonough County center is -90.646202087402 / 40.480701446533). For your convenience we have also indicated if that zip code in Mcdonough County observes Daylight Savings time.