Greenwich Township is a township in Gloucester County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 4,917, an increase of 18 (+0.4%) from the 2010 census count of 4,899, which in turn reflected an increase of 20 (+0.4%) from the 4,879 counted in the 2000 census.

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