 Rosedale Township was named for the abundant wild roses within its borders.According to the United States Census Bureau, the township has a total area of 36.3 square miles (94.1 km²), of which 34.9 square miles (90.4 km²) of it is land and 1.4 square miles (3.7 km²) of it (3.94%) is water.As of the census of 2000, there were 136 people, 48 households, and 38 families residing in the township.