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Clark is a township in southern Union County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 15,544, an increase of 788 (+5.3%) from the 2010 census count of 14,756, which in turn reflected an increase of 159 (+1.1%) from the 14,597 counted in the 2000 census.
Source: Wikipedia