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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.
Hillside Township is a densely populated township with a population of about 22,000 people living in 2.7 square miles. Irvington General Hospital serves the township. Newark Beth Medical Center is nearby too. Other attractions in and around the region include Weequatic Park Golf Club and Chancellor Playground. The township is well-served by major routes such as I-78, US Rt 22 and Routes 509 and 601.