 According to the United States Census Bureau, the township has a total area of 24.5 square miles (63.5 km²), of which, 24.5 square miles (63.3 km²) of it is land and 0.1 square miles (0.2 km²) of it (0.24%) is water.Washington Township is bordered by Middlecreek Township to the north, Penn Township to the northeast, Union and Chapman Townships to the southeast, Perry Township to the southwest, and Franklin Township to the west.The borough of Freeburg is located in the center of the township.