Bellmawr is a borough in Camden County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 11,583, reflecting an increase of 321 (+2.9%) from the 11,262 counted in the 2000 Census, which had in turn declined by 1,341 (-10.6%) from the 12,603 counted in the 1990 Census.
Bellmawr was incorporated as a borough on March 23, 1926, from portions of the now-defunct Centre Township, based on the results of a referendum held on April 21, 1926. The boroughs of Mount Ephraim, Runnemede and Lawnside were also created in the same two-day period. The borough was named for Ernest C. Bell.
Bellmawr is home to the main post office for the area, one of the largest in the state of New Jersey, handling an average of 4.5 million pieces of mail daily. In late October 2001, the office was closed due to possible anthrax contamination in the wake of the 2001 anthrax attacks. The office was re-opened several days later, in early November, after testing negative for anthrax.
Bellmawr joins Cranbury, Egg Harbor Township, Montclair and Woodbridge Township as one of the five municipalities (of 565 in the state) that have authorized dispensaries for the sale of medical marijuana.
According to the United States Census Bureau, Bellmawr borough had a total area of 3.110 square miles (8.057 km2), including 2.979 square miles (7.717 km2) of land and 0.131 square miles (0.340 km2) of water (4.22%).
The borough borders Barrington, Brooklawn, Gloucester City, Haddon Heights, Mount Ephraim, and Runnemede. Bellmawr also borders Deptford Township and Westville, both in Gloucester County.
As of the 2010 United States Census, there were 11,583 people, 4,670 households, and 3,068 families residing in the borough. The population density was 3,887.7 per square mile (1,501.0/km2). There were 4,883 housing units at an average density of 1,638.9 per square mile (632.8/km2).