Bellmawr is a Borough in Camden County, New Jersey, United States. As of the United States 2000 Census, the borough population was 11,262. 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. Bellmawr is home to the main post office for the area, one of the largest in the state of New Jersey. In late October 2001 the office was closed due to possible anthrax contamination. The office was re-opened several days later, in early November, after testing negative for anthrax.