Below is a list of Onalaska WI zip codes. For your research we have also included Onalaska Area Code, Time Zone, UTC and the local La Crosse County FIPS Code. Each Onalaska Wisconsin zip code has a center Longitude / Latitude point (the Onalaska center is -91.220100402832 / 43.8916015625). For your convenience we have also indicated if that zip code in Onalaska observes Daylight Savings time.