 South Hackensack was formed as a township by an act of the New Jersey Legislature on November 15, 1935, replacing Lodi Township, based on the results of a referendum held November 5, 1935, which passed by a margin of 309 to 15.The township's name derives from its location relative to Hackensack.According to the United States Census Bureau, the township had a total area of 0.741 square miles (1.919 km2), including 0.718 square miles (1.860 km2) of land and 0.023 square miles (0.060 km2) of water (3.11%).