Hamilton Township is a township in Atlantic County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 27,484, an increase of 981 from the 2010 census count of 26,503, which in turn reflected an increase of 6,004 from the 20,499 counted in the 2000 census. The Township of Hamilton was incorpor…Hamilton Township is a township in Atlantic County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 27,484, an increase of 981 from the 2010 census count of 26,503, which in turn reflected an increase of 6,004 from the 20,499 counted in the 2000 census. The Township of Hamilton was incorporated by the New Jersey Legislature on February 5, 1813.