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is a Borough in Morris County, New Jersey, United States. As of the United States 2000 Census, the borough population was 2,498.
Riverdale was incorporated as a borough by an Act of the New Jersey Legislature on March 12, 1923, from portions of Pequannock Township, subject to the results of a referendum passed on April 17, 1923.
According to the United States Census Bureau, the borough has a total area of 2.1 square miles (5.4 km