 Westerheim Township was organized in 1876, and derives its name from a Norwegian-language word meaning "western home".According to the United States Census Bureau, the township has a total area of 36.3 square miles (94.1 km²), of which 36.3 square miles (94.1 km²) of it is land and 0.03% is water.As of the census of 2000, there were 286 people, 97 households, and 78 families residing in the township.