Below is a list of Casco WI zip codes. For your research we have also included Casco Area Code, Time Zone, UTC and the local Kewaunee County FIPS Code. Each Casco Wisconsin zip code has a center Longitude / Latitude point (the Casco center is -87.618103027344 / 44.556701660156). For your convenience we have also indicated if that zip code in Casco observes Daylight Savings time.