Old Bridge Township is a township in Middlesex County, in the U.S. state of New Jersey, located in the Raritan Valley region and within the New York metropolitan area. As of the 2020 United States census, the township was the state's 21st-most-populous municipality, with a population of 66,876, an increase of 1,501 from the 2010 census count of 65,375, …Old Bridge Township is a township in Middlesex County, in the U.S. state of New Jersey, located in the Raritan Valley region and within the New York metropolitan area. As of the 2020 United States census, the township was the state's 21st-most-populous municipality, with a population of 66,876, an increase of 1,501 from the 2010 census count of 65,375, which in turn reflected an increase of 4,919 from the 60,456 counted in the 2000 census. As of the 2010 Census, the township was ranked 18th in the state by population, after being the state's 21st most-populous municipality in 2000. Old Bridge is a bedroom suburb of New York City located across the Raritan Bay from Staten Island, and it is about 25 miles from Manhattan, and about 30 miles south of Newark.