Keystone is a town in Bayfield County, Wisconsin, United States.

[4] As of the census[3] of 2000, there were 369 people, 146 households, and 109 families residing in the town.

There were 186 housing units at an average density of 5.2 per square mile (2.0/km2).

The racial makeup of the town was 95.93% White, 3.25% Native American, and 0.81% from two or more races.

20.5% of all households were made up of individuals, and 9.6% had someone living alone who was 65 years of age or older.