Haledon is a borough in Passaic County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 8,318, reflecting an increase of 66 from the 8,252 counted in the 2000 Census, which had in turn increased by 1,301 from the 6,951 counted in the 1990 Census.Haledon was incorporated as a borough by an act of the New Jersey Legislature on April 8, 1908, replacing the now-defunct Manchester Township, based on the results of a referendum held on May 21, 1908.