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Hillsdale is a borough in Bergen County, New Jersey, United States. As of the 2010 census, the borough population was 10,219.
Roselle Park, New Jersey - Basic Facts. The Borough of Roselle Park had a population of 13,422 as of July 1, 2016. Roselle Park ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in New Jersey. See peer rankings below. The primary coordinate point for Roselle Park is located at latitude 40.6653 and longitude -74.2667 in Union County.