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is a Borough in Middlesex County, New Jersey, United States. As of the United States 2000 Census, the borough population was 13,717.
Middlesex was incorporated as a borough by an Act of the New Jersey Legislature on April 9, 1913, from portions of Piscataway Township, based on the results of a referendum held on May 6, 1913.
According to the United States Census Bureau, the borough has a total area of 3.5 square miles (9.1 km