Pine Hill, New Jersey. Pine Hill is a borough in Camden County, New Jersey, United States. As of the 2010 United States Census, the borough had a population of 10,233, reflecting a decline of 647 (-5.9%) from the 10,880 counted in the 2000 Census, which had in turn increased by 1,026 (+10.4%) from the 9,854 counted in the 1990 Census.