Mullica Hill is a census-designated place (CDP) and unincorporated community within Harrison Township, Gloucester County, in the U.S. state of New Jersey. As of the 2020 United States census, the CDP's population was 4,698, an increase of 716 (+18.0%) from the 3,982 counted at the 2010 U.S. census, which in turn reflected an increase of 2,324 (+140.2%) from the 1,658 enumerated at the 2000 census.

Harrison Township is a township in Gloucester County in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 13,641, an increase of 1,224 (+9.9%) from the 2010 census count of 12,417, which in turn reflected an increase of 3,629 (+41.3%) from the 8,788 counted at the 2000 census.