Frankford Township is a township in Sussex County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 5,302, a decrease of 263 (−4.7%) from the 2010 census count of 5,565, which in turn reflected an increase of 145 (+2.7%) from the 5,420 counted in the 2000 census.

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