Jefferson is a town in Green County, Wisconsin, United States.

The unincorporated community of Twin Grove is also located in the town.

As of the census[2] of 2000, there were 1,212 people, 422 households, and 340 families residing in the town.

There were 437 housing units at an average density of 11.3 per square mile (4.4/km2).

15.2% of all households were made up of individuals, and 7.8% had someone living alone who was 65 years of age or older.