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Hillside, New Jersey. Hillside is a township in Union County, New Jersey, United States. As of the 2010 United States Census, the township's population was 21,404, reflecting a decline of 343 (-1.6%) from the 21,747 counted in the 2000 Census, which had in turn increased by 703 (+3.3%) from the 21,044 counted in the 1990 Census.
Sponsored Topics. Hillside is a village in Cook County, Illinois, United States. The population was 8,155 at the 2000 census. One notable landmark in Hillside is the Mount Carmel Cemetery. On the grounds of the cemetery are the graves of a number of organized crime figures, such as Al Capone and Dion O'Bannion.