[3] The township was organized in 1837, and was named after Weesaw, a local Potawatomi chief.[4][5] According to the United States Census Bureau, the township has a total area of 35.6 square miles (92.2 km2), of which 35.4 square miles (91.8 km2) is land and 0.15 square miles (0.4 km2), or 0.44%, is water..[8] As of the census[1] of 2000, there were 2,065 people, 798 households, and 589 families residing in the township.There were 886 housing units at an average density of 24.9 per square mile (9.6/km2).There were 798 households, out of which 29.7% had children under the age of 18 living with them, 60.7% were married couples living together, 7.5% had a female householder with no husband present, and 26.1% were non-families.21.3% of all households were made up of individuals, and 8.4% had someone living alone who was 65 years of age or older.