Newfield is a borough in Gloucester County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 1,553, reflecting a decline of 63 from the 1,616 counted in the 2000 Census, which had in turn increased by 24 from the 1,592 counted in the 1990 Census.Newfield was formed as a borough by an act of the New Jersey Legislature on March 8, 1924, from portions of Franklin Township, based on the results of a referendum held on April 1, 1924. In the weeks before the legislature approved the formation of the borough, a group of 240 residents traveled to Trenton by train to lobby on behalf of the creation of an independent municipality. The borough's name derives from its status as a new-field development.