Montgomery Township is a township in southern Somerset County, in the central part of 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.