Bellmawr is a borough in Camden County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 11,707, an increase of 124 (+1.1%) from the 2010 census count of 11,583, which in turn reflected an increase of 321 (+2.9%) from the 11,262 counted in the 2000 census.