Belle Mead is an unincorporated community and census-designated place (CDP) located within Montgomery Township, in Somerset County, in the U.S. state of New Jersey. As of the 2020 United States census, the CDP's population was 5,569, reflecting an expansion of the CDP from 0.74 square miles (1.9 km2) in 2010 to 4.03 square miles (10.4 km2) in 2020.

Montgomery Township is a township in southern Somerset County, in the U.S. state of New Jersey. It is located in the New York Metropolitan Area. As of the 2020 United States census, the township's population was 23,690, an increase of 1,436 (+6.5%) from the 2010 census count of 22,254, which in turn reflected an increase of 4,773 (+27.3%) from the 17,481 counted in the 2000 census.