Sumner
About Sumner
Town in Wisconsin, United StatesSumner is a town in Jefferson County, Wisconsin, United States. The population was 846 at the 2020 census. The census-designated place of Lake Koshkonong and the unincorporated communities of Busseyville, Carcajou, Glenn Oaks Beach, Koshkonong Manor, and North Shore are located within the town. The community of Blackhawk Island is located partially in the town.
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Places to go
The diner, the trailhead, the hardware store — the spots that make Sumner worth knowing.