The township saw major changes with the extension of Route 18 to the shore.

Over the next decade, a building boom started and farms gave way to developments, and the population grew to 22,772 by 1960. In 1880, the population was 1,662 and in 1950 it had reached 7,365. After the township was established, the area was made up primarily of farms and the population grew slowly. The township's name was changed to avoid confusion with the borough of Madison in Morris County. In a referendum held on November 5, 1975, voters approved changing the township's name to Old Bridge Township by a margin of 7,150 votes to 4,888. What is now Old Bridge Township was originally incorporated as Madison Township by an act of the New Jersey Legislature on March 2, 1869, from portions of South Amboy Township (now City of South Amboy). Old Bridge is a bedroom suburb of New York City located across the Raritan Bay from Staten Island, and it is about 25 miles (40В km) from Manhattan, and about 30 miles (48В km) south of Newark. As of the 2010 Census, the township was the state's 18th largest municipality, after being the state's 21st most-populous municipality in 2000.

As of the 2010 United States Census, the township had a total population of 65,375, reflecting an increase of 4,919 (+8.1%) from the 60,456 counted in the 2000 Census, which had in turn increased by 3,981 (+7.0%) from the 56,475 counted in the 1990 Census. The township is located in the Raritan Valley region within the New York metropolitan area.

Old Bridge Township is a township in Middlesex County, New Jersey, United States.

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