Hillside
About Hillside
Township in Union County, New Jersey, USHillside is a township in Union County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 22,456, an increase of 1,052 (+4.9%) from the 2010 census count of 21,404, which in turn reflected a decline of 343 (−1.6%) from the 21,747 counted in the 2000 census. Hillside was incorporated as a township on April 3, 1913, from portions of Union Township, based on the results of a referendum held on April 29, 1913. The township was named for the surrounding hills. The township is split between area codes 908 and 973.
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