Harmony Township is a township located in Warren County in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 2,503,
Harmony was incorporated as a township by an act of the New Jersey Legislature on April 8, 1839, from portions of Greenwich Township and Oxford Township, based on the results of a referendum held that day. Phillipsburg Township was created March 7, 1851, from portions of the township. The township was named for Harmon Shipman, an early settler.
Geography
According to the U.S. Census Bureau, Harmony township had a total area of 24.13 square miles (62.49 km<sup>2</sup>), including 23.75 square miles (61.51 km<sup>2</sup>) of land and 0.38 square miles (0.98 km<sup>2</sup>) of water (1.56%).
Other unincorporated communities, localities and place names located partially or completely within the township include Allens Mills, Harmony Station, Lower Harmony, Martins Creek Station, Montana and Roxburg.
The township borders the Warren County municipalities of Franklin Township, Lopatcong Township and White Township.