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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, New Jersey. 1  Hillside: Family Monuments, Hillside Cemetary. 2  Hillside: Best hot Dogs I have ever eaten. Visiting with Husband from Florida to see where he grew up and had to go get a hot dog. 3  Hillside: Hillside High School.  add. your.