Below is a list of Mchenry County IL zip codes. For your research we have also included Mchenry County Area Code, Time Zone, UTC and the local County FIPS Code. Each Mchenry County Illinois zip code has a center Longitude / Latitude point (the Mchenry County center is -88.36840057373 / 42.310001373291). For your convenience we have also indicated if that zip code in Mchenry County observes Daylight Savings time.