Perch Lake Township is located immediately west of the city of Cloquet.

The community of Sawyer is located immediately south of the township.

Perch Lake Township is located within the Fond du Lac Indian Reservation.

As of the census[1] of 2000, there were 998 people, 385 households, and 277 families residing in the township.

24.2% of all households were made up of individuals, and 9.1% had someone living alone who was 65 years of age or older.