Woodbridge is an unincorporated community and census-designated place within Woodbridge Township, in Middlesex County, New Jersey, United States. As of the 2020 census, the CDP's population was 19,839, out of 103,639 in all of Woodbridge Township. Despite the similarity in the name of the CDP and the township, the two are not coextensive; the CDP occupies 15.7% of the township's 24.51 square miles.