 21.0 square miles (54.4 km2) of it is land and 0.2 square miles (0.6 km2) of it (1.13%) is water.As of the census of 2000, there were 10,876 people, 4,501 households, and 2,966 families residing in the township.The population density was 517.6 people per square mile (199.9/km2).