According to the United States Census Bureau, the borough had a total area of 9.253 square miles (23.965 km2), including 7.990 square miles (20.694 km2) of land and 1.263 square miles (3.271 km2) of water (13.65%)
Both Wanaque (formerly Midvale) and Haskell have their own ZIP code and are served by separate post offices.