Middletown, NJ is a city located in Monmouth County, New Jersey and has a land area of 13.00 square miles (33.67 km2). The water area for the city is 0.04 square miles or 0.10 km2. There is one unique zip code in Middletown, New Jersey and it is 07748. The area code(s) for Middletown is 732/848/908.
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