Hackettstown, NJ is a city located in Warren County, New Jersey and has a land area of 37.33 square miles (96.68 km2). The water area for the city is 0.42 square miles or 1.09 km2. There is one unique zip code in Hackettstown, New Jersey and it is 07840. The area code(s) for Hackettstown is 908.
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