 Thief Lake Township was organized in 1896, and named for Thief Lake.According to the United States Census Bureau, the township has a total area of 36.5 square miles (94.5 km²), of which 27.6 square miles (71.6 km²) of it is land and 8.9 square miles (23.0 km²) of it (24.31%) is water.As of the census of 2000, there were 48 people, 20 households, and 16 families residing in the township.