Sumner is a town in Trempealeau County, Wisconsin, United States.

As of the census[2] of 2000, there were 806 people, 291 households, and 229 families residing in the town.

There were 305 housing units at an average density of 9.0 per square mile (3.5/km2).

The racial makeup of the town was 99.88% White and 0.12% Native American.

16.5% of all households were made up of individuals, and 8.2% had someone living alone who was 65 years of age or older.