Below is a list of Eureka WI zip codes. For your research we have also included Eureka Area Code, Time Zone, UTC and the local Winnebago County FIPS Code. Each Eureka Wisconsin zip code has a center Longitude / Latitude point (the Eureka center is -88.842002868652 / 44.004398345947). For your convenience we have also indicated if that zip code in Eureka observes Daylight Savings time.