 The Octagon Stone Schoolhouse was added to the National Register of Historic Places in 1977.According to the United States Census Bureau, the township has a total area of 28.2 square miles (72.9 km²), of which, 27.5 square miles (70.4 km²) of it is land and 0.7 square miles (1.8 km²) of it (2.48%) is water.At the 2010 census, there were 1,768 people, 645 households, and 487 families in the township.