Below is a list of Winnebago County WI zip codes. For your research we have also included Winnebago County Area Code, Time Zone, UTC and the local County FIPS Code. Each Winnebago County Wisconsin zip code has a center Longitude / Latitude point (the Winnebago County center is -88.626403808594 / 44.068500518799). For your convenience we have also indicated if that zip code in Winnebago County observes Daylight Savings time.