 According to the United States Census Bureau, the township has a total area of 20.7 square miles (53.7 km2).20.1 square miles (52.2 km2) of it is land and 0.6 square miles (1.5 km2) of it (2.84%) is water.Muncy Creek has its confluence with the West Branch Susquehanna River in the township, and the township surrounds the borough of Muncy.As of the census of 2000, there were 3,487 people, 1,360 households, and 1,005 families residing in the township.