Below is a list of Oconomowoc WI zip codes. For your research we have also included Oconomowoc Area Code, Time Zone, UTC and the local Waukesha County FIPS Code. Each Oconomowoc Wisconsin zip code has a center Longitude / Latitude point (the Oconomowoc center is -88.493896484375 / 43.106601715088). For your convenience we have also indicated if that zip code in Oconomowoc observes Daylight Savings time.