- Winona County, Minnesota (data.census.gov)
Winona County, Minnesota has 626.2 square miles of land area and is the 49th largest county in Minnesota by total area. Winona County, Minnesota is bordered by Wabasha County, Minnesota, Olmsted County, Minnesota, Buffalo County, Wisconsin, Houston County, Minnesota, La Crosse County, Wisconsin, Fillmore County, Minnesota, and Trempealeau County, Wisconsin.