Annandale, NJ is a city located in Hunterdon County, New Jersey and has a land area of 15.02 square miles (38.90 km2). The water area for the city is 0.20 square miles or 0.52 km2. There is one unique zip code in Annandale, New Jersey and it is 08801. The area code(s) for Annandale is 908.
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