Oldwick, NJ is a city located in Hunterdon County, New Jersey and has a land area of 2.63 square miles (6.81 km2). The water area for the city is 0.01 square miles or 0.03 km2. There is one unique zip code in Oldwick, New Jersey and it is 08858. The area code(s) for Oldwick is 908.
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