 According to the United States Census Bureau, the township has a total area of 19.3 square miles (50.1 km2), of which, 18.9 square miles (49.0 km2) of it is land and 0.4 square miles (1.1 km2) of it (2.12%) is water.As of the census of 2000, there were 639 people, 243 households, and 185 families residing in the township.The population density was 33.7 people per square mile (13.0/km2).