Welcome

Nestled in the northeast corner of Somerset County  lies the small borough of North Plainfield. It is bordered on the  northwest by the first ridge of the Watchung Mountains and, on the south  and east, the Green Brook provides a natural boundary between Union and  Somerset Counties. Rock Avenue, on the west, divides the towns of North Plainfield and Green Brook.

Flowing through the town are two mainwaterways,  the Green Brook, as mentioned, and the Stony Brook. These two streams  now quietly flowing through the Boro were once an important  source of power and because of the rich, fertile soil along their  banks many early settlers made this area their home.

Originally, Somerset County operated as a single  township. In 1769, by Royal Charter, Bernards Township was formed out of  the northern precinct of the county. On March 5, 1806, Warren was  created as a separate township composed of the present day North Plainfield, Warren, Green Brook and Watchung.

On April 2, 1872, an Act of the New Jersey Legislature was passed, which divided North Plainfield Township from the Township of Warren. This new township included the towns of North Plainfield, Watchung and Green Brook. The boundaries of this new township were set up in the Act, known as Assembly No. 113. North Plainfield was set off from the Township in the year 1885, Watchung in the year 1926,  and Green Brook in 1932.