 Presently, it is an unregistered historic place that is privately owned.According to the United States Census Bureau, Williams Township has a total area of 18.7 square miles (48.5 km2), of which, 18.4 square miles (47.6 km2) of it is land and 0.3 square miles (0.9 km2) of it (1.76%) is water.It is drained by the Delaware River, which separates it on the east from New Jersey.