Below is a list of Winnebago IL zip codes. For your research we have also included Winnebago Area Code, Time Zone, UTC and the local Winnebago County FIPS Code. Each Winnebago Illinois zip code has a center Longitude / Latitude point (the Winnebago center is -89.241401672363 / 42.265201568604). For your convenience we have also indicated if that zip code in Winnebago observes Daylight Savings time.