Below is a list of Jo Daviess County IL zip codes. For your research we have also included Jo Daviess County Area Code, Time Zone, UTC and the local County FIPS Code. Each Jo Daviess County Illinois zip code has a center Longitude / Latitude point (the Jo Daviess County center is -90.197303771973 / 42.408100128174). For your convenience we have also indicated if that zip code in Jo Daviess County observes Daylight Savings time.