Washington Township is a township in Warren County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 6,492, a decrease of 159 (−2.4%) from the 2010 census count of 6,651, which in turn reflected an increase of 403 (+6.5%) from the 6,248 counted in the 2000 census.

Mansfield Township is a township in Warren County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 7,781, its highest decennial census count ever, and an increase of 56 (+0.7%) from the 2010 census count of 7,725, which in turn reflected reflected an increase of 1,072 (+16.1%) from the 6,653 counted in the 2000 census.