Bellmore is a hamlet (an census-designated place) in Nassau County, New York, United States. The population according to the 2000 census was 16,441. Bellmore is located on the south shore of Long Island, approximately 27 miles (43 km) east of Manhattan, and 10 miles (16 km) east of the Nassau-Queens (New York City) Line. North Bellmore is a census-designated place (CDP) in Nassau County, New York, United States. The population was 20,079 at the 2000 census.