Below is a list of Lake Mills IA zip codes. For your research we have also included Lake Mills Area Code, Time Zone, UTC and the local Winnebago County FIPS Code. Each Lake Mills Iowa zip code has a center Longitude / Latitude point (the Lake Mills center is -93.532501220703 / 43.419300079346). For your convenience we have also indicated if that zip code in Lake Mills observes Daylight Savings time.