Frelinghuysen 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 2,199, a decrease of 31 (−1.4%) from the 2010 census count of 2,230, which in turn reflected an increase of 147 (+7.1%) from the 2,083 counted in the 2000 census.

Hardwick 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 1,598, a decrease of 98 (−5.8%) from the 2010 census count of 1,696, which in turn reflected an increase of 232 (+15.8%) from the 1,464 counted in the 2000 census.