South Plainfield

South Plainfield is a borough in Middlesex County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 23,385, reflecting an increase of 1,575 (+7.2%) from the 21,810 counted in the 2000 Census, which had in turn increased by 1,321 (+6.4%) from the 20,489 counted in the 1990 Census.South Plainfield was incorporated by an act of the New Jersey Legislature on March 12, 1926, from portions of Piscataway Township, based on the results of a referendum passed on April 6, 1926. The borough's name derives from Plainfield, which derived its name from a local estate or from its scenic location.GeographyAccording to the United States Census Bureau, the borough had a total area of 8.361 square miles (21.653 km2), including 8.327 square miles (21.566 km2) of land and 0.034 square miles (0.087 km2) of water (0.40%).Unincorporated communities, localities and place names located partially or completely within the township include Avon Park, Hadley Airport, Holly Park and Samptown.The borough is bordered by Piscataway Township on the south and west, Edison Township on the east, both in Middlesex County, and Plainfield on the north and Scotch Plains both in Union County.