Below is a list of Williams Bay WI zip codes. For your research we have also included Williams Bay Area Code, Time Zone, UTC and the local Walworth County FIPS Code. Each Williams Bay Wisconsin zip code has a center Longitude / Latitude point (the Williams Bay center is -88.541496276855 / 42.577899932861). For your convenience we have also indicated if that zip code in Williams Bay observes Daylight Savings time.