Prospect Park is a borough in Passaic County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 6,372, an increase of 507 (+8.6%) from the 2010 census count of 5,865, which in turn reflected an increase of 86 (+1.5%) from the 5,779 counted in the 2000 census.

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