Onalaska is a city in La Crosse County, Wisconsin, United States. The population was 18,803 at the 2020 census. It is a principal city of the La Crosse–Onalaska metropolitan area.
Campbell was a township along the Mississippi River in La Crosse County, Wisconsin, United States. It was part of the La Crosse, Wisconsin Metropolitan Statistical Area. The population was 4,284 as of