Pennsville Township is a township in Salem County, in the U.S. state of New Jersey. As of the 2010 United States Census, the township's population was 13,409, reflecting an increase of 215 (+1.6%) from the 13,194 counted in the 2000 Census, which had in turn declined by 600 (-4.3%) from the 13,794 counted in the 1990 Census. The township is named for William Penn. The township includes the state's westernmost point.
Lower Penns Neck Township was formed on July 10, 1721, when Penn's Neck Township was subdivided and Upper Penns Neck Township (now Carneys Point Township) was also formed. The township was incorporated by an act of the New Jersey Legislature on February 21, 1798, as one of New Jersey's original group of 104 townships. The township was renamed Pennsville Township based on the results of a referendum held on November 2, 1965.
According to the United States Census Bureau, the township had a total area of 24.58 square miles (63.66 km2), including 21.27 square miles (55.08 km2) of land and 3.31 square miles (8.58 km2) of water (13.48%).
Pennsville CDP (with a 2010 Census population of 11,888) is an unincorporated community and census-designated place (CDP) area located within Pennsville Township.
Other unincorporated communities, localities and place names located partially or completely within the township include Cedar Point, Church Landing, Churchtown, Cobbs Island, Deepwater, Deepwater Point, Finns Point, Fort Mott, Goose Island Flats, Harrisonville, Kellys Point, Marsh Point, Penn Brick Beach, Salem Cove and Travis Cove.
The Salem River flows along the township's eastern and southern boundaries.
The township borders the Salem County municipalities of Carneys Point Township, Elsinboro Township, Mannington Township and Salem. Pennsville Township also borders a section of New Castle County, Delaware, which is one of only two points of land east of the Delaware River that are within the state of Delaware, the other being on Artificial Island in Lower Alloways Creek Township.
The 2010 United States Census counted 13,409 people, 5,491 households, and 3,706 families in the township. The population density was 630.2 inhabitants per square mile (243.3/km2). There were 5,914 housing units at an average density of 278.0 per square mile (107.3/km2). The racial makeup was 94.68% (12,696) White, 1.54% (206) Black or African American, 0.23% (31) Native American, 1.42% (190) Asian, 0.01% (2) Pacific Islander, 0.92% (124) from other races, and 1.19% (160) from two or more races.