Knowlton Township is a township in Warren County, New Jersey, United States. As of the 2010 United States Census, the township’s population was 3,055, reflecting an increase of 78 (+2.6%) from the 2,977 counted in the 2000 Census, which had in turn increased by 434 (+17.1%) from the 2,543 counted in the 1990 Census.

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. 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.

According to the United States Census Bureau, the township had a total area of 25.329 square miles (65.602 km²), including 24.749 square miles (64.100 km²) of land and 0.580 square miles (1.503 km²) of water (2.29%). The township is located in the Kittatinny Valley which is a section of the Great Appalachian Valley that stretches 700 miles (1,100 km) from Canada to Alabama.

Columbia (with a 2010 Census population of 229), Delaware (150) and Hainesburg (91) are unincorporated communities and census-designated places (CDPs) located within the township.

Other unincorporated communities, localities and place names located partially or completely within the township include Browning, Deckers Ferry, Mount Pleasant, Polkville, Ramseyburg and Warrington.

As of the 2010 United States Census, there were 3,055 people, 1,097 households, and 864.4 families residing in the township. The population density was 123.4 per square mile (47.6/km²). There were 1,212 housing units at an average density of 49.0 per square mile (18.9/km²). The racial makeup of the township was 96.07% (2,935) White, 0.92% (28) Black or African American, 0.29% (9) Native American, 0.92% (28) Asian, 0.00% (0) Pacific Islander, 0.75% (23) from other races, and 1.05% (32) from two or more races. Hispanic or Latino of any race were 3.63% (111) of the population.

Source: Wikipedia