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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 is located in northeast Illinois. Hillside is part of Cook County. Hillside has 3.18 square miles of land area and has no water area. As of 2010, the total Hillside population is 8,157, which has grown 0.02% since 2000. The population growth rate is lower than the state average rate of 3.31% and is much lower than the national average rate of 9.71%. Hillside median household income is $52,395 in 2008-2012 and has grown by 3.19% since 2000. The income growth rate is much lower than the state average rate of 22.03% and is much lower than the national average rate of 26.32%.