Lopatcong Township () is a township in Warren County, New Jersey, United States. As of the 2020 United States census, the township's population was 8,776,
History
What is now Lopatcong Township was created as Phillipsburg Township on March 7, 1851, by an act approved by the New Jersey Legislature from portions of Greenwich Township and Harmony Township. After Phillipsburg was incorporated as an independent municipality on March 8, 1861, the township changed its name to Lopatcong as of March 18, 1863, after the Lopatcong Creek in the area.
The name of the creek and township, Lopatcong, has its origin in four words of the Lenape Native Americans, "Lowan peek achtu onk," which means "winter watering place for deer".
Geography
According to the U.S. Census Bureau, the township had a total area of 7.38 square miles (19.10 km<sup>2</sup>), including 7.32 square miles (18.95 km<sup>2</sup>) of land and 0.06 square miles (0.16 km<sup>2</sup>) of water (0.81%).
The township borders the Warren County municipalities of Greenwich Township, Harmony Township, Phillipsburg and Pohatcong Township.
Lopatcong Township is northeast of Allentown and west of New York City.