North Plainfield, New Jersey

North Plainfield is a borough in Somerset County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 21,936, reflecting an increase of 833 (+3.9%) from the 21,103 counted in the 2000 Census, which had in turn increased by 2,283 (+12.1%) from the 18,820 counted in the 1990 Census.

North Plainfield Township was created from portions of Warren Township, New Jersey by an Act of the New Jersey Legislature passed on April 2, 1872. The borough of North Plainfield became an independent municipality on June 9, 1885. The name derives from Plainfield, which derived its name from a local estate or from its scenic location.

In 1902, the New Jersey Legislature approved measures that would have allowed the borough to become part of Union County (a measure repealed in 1903) and to allow for a merger of North Plainfield with the City of Plainfield subject to the approval of a referendum by voters in both municipalities.

North Plainfield is home to the Washington Park Historic District.