Haddonfield is a borough located in Camden County, New Jersey, United States. As of the 2010 United States Census, the borough had a total population of 11,593, reflecting a decline of 66 from the 11,659 counted in the 2000 Census, which had in turn increased by 31 from the 11,628 counted in the 1990 Census.Haddonfield was incorporated by an act of the New Jersey Legislature on April 6, 1875, within portions of Haddon Township following a referendum on the same day. The borough became an independent municipality in 1894. The borough was named for Elizabeth Haddon, an early settler of the area.