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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.
Hillsdale was reincorporated as a borough by an Act of the New Jersey Legislature on March 2, 1923, based on the results of a referendum held on April 24, 1923. Hillsdale is located at 41Â°00â²27â³N 74Â°02â²33â³W / 41.007389Â°N 74.042472Â°W / 41.007389; -74.042472 (41.007389, -74.042472).