[3] The village of Cass City is located within the southern part of the township.

According to the United States Census Bureau, the township has a total area of 35.6 square miles (92 km2), all land.

As of the census[1] of 2000, there were 3,659 people, 1,479 households, and 1,004 families residing in the township.

There were 1,561 housing units at an average density of 43.9 per square mile (16.9/km2).

29.0% of all households were made up of individuals, and 14.9% had someone living alone who was 65 years of age or older.