Geography Īccording to the United States Census Bureau, North Plainfield borough had a total area of 2.82 square miles (7.31 km 2), including 2.81 square miles (7.27 km 2) of land and 0.01 square miles (0.03 km 2) of water (0.46%). North Plainfield is home to the Washington Park Historic District, which was listed on the National Register of Historic Places in 1987. 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New Jersey Legislature approved measures that would have allowed the borough to become part of Union County (a measure repealed in 1903) and to allow for a merger of North Plainfield with the City of Plainfield subject to the approval of a referendum by voters in both municipalities.

The name derives from Plainfield, which derived its name from a local estate or from its scenic location. The borough of North Plainfield became an independent municipality on June 9, 1885. North Plainfield Township was created from portions of Warren Township by an act of the New Jersey Legislature passed on April 2, 1872. As of the 2020 United States census, the borough's population was 22,808, an increase of 872 (+4.0%) from the 2010 census count of 21,936, which in turn reflected an increase of 833 (+3.9%) from the 21,103 counted in the 2000 census. It is located within the Raritan Valley region. North Plainfield is a borough in Somerset County, in the U.S.

Lawrence township nj mayor