Plainsboro, NJ is a city located in Middlesex County, New Jersey and has a land area of 7.53 square miles (19.50 km2). The water area for the city is 0.15 square miles or 0.39 km2. There is one unique zip code in Plainsboro, New Jersey and it is 08536. The area code(s) for Plainsboro is 609.
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