Long Lake is an unincorporated census-designated place in the town of Long Lake, Florence County, Wisconsin, United States. Long Lake is located on the eastern shore of Long Lake along Wisconsin Highway 139, west-southwest of Florence. As of the 2020 census, its population was 59. The community became a census-designated place in 2010. The community has the 54542 ZIP code.
Whites make up the largest racial/ethnic group in Long Lake (100.0%).