Iselin () is an unincorporated community and census-designated place (CDP) located within Woodbridge Township, in Middlesex County, in the U.S. state of New Jersey. As of the 2020 United States census, Iselin's population was 20,088,
Previously known as "Perrytown" and "Unionville", Iselin received its current name after New York City investment banker and philanthropist Adrian Iselin, who established a finishing school in the 1870s for girls from wealthy New York families there. Iselin additionally subsidized the erection of a new train station, which was later replaced by a newer station to the south known as Metropark.
Geography
Iselin is in northeastern Middlesex County, in the northwest part of Woodbridge Township. It is bordered by the Woodbridge communities of Colonia to the north, Avenel to the northeast, Woodbridge to the southeast, and Menlo Park Terrace to the south, while to the west it is bordered by Edison Township. It is northeast of New Brunswick, the Middlesex county seat, and southwest of Newark.
According to the U.S. Census Bureau, Iselin has a total area of , including of water (0.03%). Tata Consultancy Services, Mott MacDonald, Ernst & Young, Mizuho, Wells Fargo, JPMorgan Chase, Accenture, Level 3 Communications, BT Group, UBS, Elevance Health, and TIAA.