Below is a list of Saint Croix County WI zip codes. For your research we have also included Saint Croix County Area Code, Time Zone, UTC and the local County FIPS Code. Each Saint Croix County Wisconsin zip code has a center Longitude / Latitude point (the Saint Croix County center is -92.45760345459 / 45.035598754883). For your convenience we have also indicated if that zip code in Saint Croix County observes Daylight Savings time.