Rush River is a town in St. Croix County, Wisconsin, United States.

According to the United States Census Bureau, the town has a total area of 17.9 square miles (46.3 km2), all of it land.

There were 173 housing units at an average density of 9.7 per square mile (3.7/km2).

10.5% of all households were made up of individuals, and 4.7% had someone living alone who was 65 years of age or older.

None of the families and 2.0% of the population were living below the poverty line, including no under eighteens and none of those over 64.