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Franklin is a borough in Sussex County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 4,912, a decrease of 133 (−2.6%) from the 2010 census count of 5,045, which in turn reflected a decline of 115 (−2.2%) from the 5,160 counted in the 2000 census.
Source: Wikipedia