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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.
The Hillside Historical Society was established in the 1980s in the Woodruff home on Conant Street, perhaps the township's oldest. The Woodruff House and Eaton Store Museum is operated and maintained by the Hillside Historical Society.