The south quarter of the city of Pine River is located within Wilson Township geographically but is a separate entity.

As of the census[1] of 2000, there were 551 people, 208 households, and 138 families residing in the township.

The racial makeup of the township was 97.82% White, 0.91% Native American, 0.18% Asian, 0.18% Pacific Islander, and 0.91% from two or more races.

There were 208 households, out of which 35.6% had children under the age of 18 living with them, 55.8% were married couples living together, 7.7% had a female householder with no husband present, and 33.2% were non-families.

26.4% of all households were made up of individuals, and 13.0% had someone living alone who was 65 years of age or older.