East Brunswick is a township in Middlesex County, New Jersey, United States. The township is a suburb of New York City on the southern shores of the Raritan River. According to the 2010 United States Census, the township's population was 47,512, reflecting an increase of 756 (+1.6%) from the 46,756 counted in the 2000 Census, which had in turn increased by 3,208 (+7.4%) from the 43,548 counted in the 1990 Census.
East Brunswick was incorporated as a township by an Act of the New Jersey Legislature on February 28, 1860, from portions of both Monroe Township and North Brunswick Township. Portions of the township were taken to form Washington town within the township (February 23, 1870; became independent as South River on February 28, 1898), Helmetta (March 20, 1888), Milltown (January 29, 1889) and Spotswood (April 15, 1908).
As of the 2010 Census, the Census Bureau calculated that New Jersey's center of population was located a few hundred feet east off of Nenninger Lane, near the New Jersey Turnpike. Based on the results of the 2000 Census, the state's center of population was located on Milltown Road in East Brunswick.