North Brunswick is a township in Middlesex County, New Jersey, United States. At the 2010 United States Census, the population was 40,742, reflecting an increase of 4,455 from the 36,287 counted in the 2000 Census, which had in turn increased by 5,000 from the 31,287 counted in the 1990 Census. Located south of the city of New Brunswick, North Brunswick was named for its earlier-established neighbor, South Brunswick, New Jersey. The "Brunswick" comes from New Brunswick, which was named after the German city of Braunschweig 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.