Deerfield Township is a township in Cumberland County, in the U.S. state of New Jersey. It is part of the Vineland--Bridgeton metropolitan statistical area, which encompasses those cities and all of Cumberland County for statistical purposes and which constitutes a part of the Delaware Valley. As of the 2020 United States census, the township's population was 3,136,
Deerfield Township was formed as a precinct on January 19, 1748, and was incorporated by an act of the New Jersey Legislature on February 21, 1798, as one of New Jersey's initial group of 104 townships. Portions of the township were taken to form Bridgeton Township (March 3, 1845) and Upper Deerfield Township (February 23, 1922). The township was named for Deerfield, Massachusetts.
Geography
According to the United States Census Bureau, the township had a total area of 16.88 square miles (43.72 km<sup>2</sup>), including 16.84 square miles (43.62 km<sup>2</sup>) of land and 0.04 square miles (0.10 km<sup>2</sup>) of water (0.22%).
Other unincorporated communities, localities and place names located partially or completely within the township include Carmel and Garton.
Deerfield Township borders Fairfield Township, Millville, Upper Deerfield Township and Vineland in Cumberland County; and Pittsgrove Township in Salem County.