 According to Warren Upham, Lynn Township may be named after Lynn, Massachusetts.According to the United States Census Bureau, the township has a total area of 33.1 square miles (85.8 km²), of which 31.8 square miles (82.3 km²) of it is land and 1.4 square miles (3.5 km²) of it (4.10%) is water.As of the census of 2000, there were 604 people, 216 households, and 174 families residing in the township.