Piscataway Township is a Township in Middlesex County, New Jersey, United States. As of the 2010 United States Census, the township population was 56,044. Piscataway Township was formed on December 18, 1666, and officially incorporated on February 21, 1798. The community, the fifth oldest municipality in New Jersey, has grown from Native American territory, through a colonial period and is one of the links in the earliest settlement of the Atlantic Ocean seacoast that ultimately led to the formation of the United States. Over the years, portions of Piscataway were taken to form Raritan Township (March 17, 1870, now Edison), Dunellen (October 28, 1887), Middlesex (April 9, 1913) and South Plainfield (March 10, 1926).