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Riverdale is a borough in Morris County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 4,107, an increase of 548 (+15.4%) from the 2010 census count of 3,559, which in turn reflected an increase of 1,061 (+42.5%) from the 2,498 counted in the 2000 census.
Source: Wikipedia