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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.
Recent posts about Hillside, New Jersey on our local forum with over 2,000,000 registered users. Hillside is mentioned 753 times on our forum: Latest news from Hillside, NJ collected exclusively by city-data.com from local newspapers, TV, and radio stations. Ancestries: Portuguese (11.0%), Polish (5.0%), West Indian (4.3%), Italian (4.1%), Irish (3.3%), Subsaharan African (2.8%).