Piscataway is a township in Middlesex County, in the U.S. state of New Jersey. It is a suburb of the New York metropolitan area, in the Raritan Valley. As of the 2020 United States census, the township's population was 60,804, an increase of 4,760 from the 2010 census count of 56,044, which in turn reflected an increase of 5,562 from 50,482 at the 2000 …Piscataway is a township in Middlesex County, in the U.S. state of New Jersey. It is a suburb of the New York metropolitan area, in the Raritan Valley. As of the 2020 United States census, the township's population was 60,804, an increase of 4,760 from the 2010 census count of 56,044, which in turn reflected an increase of 5,562 from 50,482 at the 2000 census.