Monroe Township is a township in southern Middlesex County, New Jersey, United States. It is part of the outer-ring suburbs of the New York Metropolitan area. As of the 2010 United States Census, the township’s population was 39,132, reflecting an increase of 11,133 (+39.8%) from the 27,999 counted in the 2000 Census, which had in turn increased by 5,744 (+25.8%) from the 22,255 counted in the 1990 Census.

Monroe Township was incorporated as a township by an act of the New Jersey Legislature on April 9, 1838, from portions of South Amboy Township, based on the results of a referendum held that same day. Portions of the township were taken to form East Brunswick Township (February 28, 1860), Cranbury Township (March 7, 1872), and Jamesburg (March 19, 1887).

Monroe Township was founded in 1838 and named in honor of the President of the United States James Monroe.

Monroe completely surrounds Jamesburg, making it part of 21 pairs of “doughnut towns” in the state, where one municipality entirely surrounds another. The township borders Cranbury Township, East Brunswick Township, Helmetta, Old Bridge Township, South Brunswick Township, and Spotswood in Middlesex County; East Windsor Township in Mercer County; and Manalapan Township and Millstone Township in Monmouth County.

As of the 2010 United States Census, there were 39,132 people, 16,497 households, and 10,871.523 families residing in the township. The population density was 932.3 per square mile (360.0/km²). There were 18,002 housing units at an average density of 428.9 per square mile (165.6/km²). The racial makeup of the township was 81.55% (31,913) White, 3.92% (1,533) Black or African American, 0.08% (33) Native American, 12.60% (4,930) Asian, 0.01% (4) Pacific Islander, 0.62% (244) from other races, and 1.21% (475) from two or more races. Hispanic or Latino of any race were 4.28% (1,673) of the population.

Source: Wikipedia