Metuchen is a borough in Middlesex County, New Jersey, United States, which is 5 miles northeast of New Brunswick, 13 miles southwest of Newark, 17 miles southwest of Jersey City, and 21 miles southwest of Manhattan, all part of the New York metropolitan area. Metuchen is completely surrounded by Edison. As of the 2010 United States Census, the borough's population was 13,574, reflecting an increase of 734 from the 12,840 counted in the 2000 Census, which had in turn increased by 36 from the 12,804 counted in the 1990 Census.Metuchen was incorporated as a borough by an act of the New Jersey Legislature on March 20, 1900, from portions of Raritan Township.