South Fork is a town in Rusk County, Wisconsin, United States.

The unincorporated community of South Fork is located in the town.

There were 91 housing units at an average density of 2.6 per square mile (1.0/km2).

19.6% of all households were made up of individuals, and 11.8% had someone living alone who was 65 years of age or older.

There were 9.5% of families and 15.7% of the population living below the poverty line, including 34.6% of under eighteens and 11.4% of those over 64.