Allentown, NJ is a city located in Monmouth County, New Jersey and has a land area of 27.19 square miles (70.42 km2). The water area for the city is 0.63 square miles or 1.63 km2. There is one unique zip code in Allentown, New Jersey and it is 08501. The area code(s) for Allentown is 609.
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