Knowlton Township is a township in Warren County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 2,894,
History
thumb|[[Ramsaysburg Homestead, listed on the National Register of Historic Places]]
Knowlton Township was created as a precinct by Royal charter from portions of Oxford Township on February 23, 1763, while the area was still part of Sussex County, and was incorporated as a township by an act of the New Jersey Legislature on February 21, 1798, and then became part of the newly created Warren County on November 20, 1824. Portions of the township were taken to form Hope Township (April 8, 1839) and Blairstown Township (April 14, 1845).
Knowlton's name is variously attributed to Thomas Knowlton, a Colonel in the Continental Army during the American Revolutionary War who was killed in action at the Battle of Harlem Heights, or to the knolls that characterize the area. In some older sources, the name is spelled "Knawltown".
The township is served by postal ZIP Codes in Columbia (07832) and Delaware (07833), although a small number of Knowlton residents receive postal deliveries via the Blairstown (07825) post office. Within the township are several small hamlets, including Browning, Deckers Ferry, Mount Pleasant, Polkville, Ramseyburg, Warrington and Knowlton itself.
Geography
According to the United States Census Bureau, the township had a total area of 25.33 square miles (65.60 km<sup>2</sup>), including 24.72 square miles (64.03 km<sup>2</sup>) of land and 0.60 square miles (1.56 km<sup>2</sup>) of water (2.38%).
Other unincorporated communities, localities and place names located partially or completely within the township include Browning, Deckers Ferry, Mount Pleasant, Polkville, Ramseyburg and Warrington.
The township borders the Warren County municipalities of Blairstown Township, Hardwick Township, Hope Township and White Township.