South Plainfield, NJ is a city located in Middlesex County, New Jersey and has a land area of 8.22 square miles (21.29 km2). The water area for the city is 0.04 square miles or 0.10 km2. There is one unique zip code in South Plainfield, New Jersey and it is 07080. The area code(s) for South Plainfield is 732.
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