North Brunswick was first mentioned in Middlesex Freeholder Board minutes of February 28, 1779. North Brunswick Township was incorporated on February 21, 1798, by the New Jersey Legislature's Township Act of 1798 as one of the state's initial group of 104 townships. Portions of the township have since separated to create East Brunswick (February 28, 1860) and Milltown (January 29, 1889). Territorial exchanges were made with Franklin Township, Somerset County, New Jersey in 1850 and 1858, with South Brunswick in 1856 and with New Brunswick in 1860, 1917 and 1929.
North Brunswick is a township in Middlesex County, in the U.S. state of New Jersey. It is centrally located in the Raritan Valley region within the New York metropolitan area. As of the 2020 United States census, the township's population was 43,905, an increase of 3,163 (+7.8%) from the 2010 census count of 40,742, which in turn reflected an increase of 3,455 (+12.3%) from the 36,287 counted in the 2000 census. North Brunswick is located south of New Brunswick. It was named named for its earlier-established neighbor, South Brunswick. Brunswick comes from New Brunswick, which was named after the German city of Braunschweig, formerly translated in English as Brunswick or for the British royal House of Brunswick. North and South Brunswick, in turn, became the namesakes for East Brunswick. Alternatively, the city gets its name from King George II of Great Britain, the Duke of Brunswick-Lüneburg.