Stewartsville, NJ is a city located in Warren County, New Jersey and has a land area of 15.46 square miles (40.04 km2). The water area for the city is 0.06 square miles or 0.16 km2. There is one unique zip code in Stewartsville, New Jersey and it is 08886. The area code(s) for Stewartsville is 908.
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