Colonia is an unincorporated community and census-designated place (CDP) in Woodbridge Township in Middlesex County in the U.S. state of New Jersey. As of the 2020 United States census, the CDP's population was 18,609.
The Garden State Parkway passes through the western portion of the CDP but does not interchange there. For northbound Garden State Parkway traffic only there is a service plaza in Colonia; it is the parkway's only area located on private property.
In 2018 the president of the Historical Association of Woodbridge, Daniel D'Arcy, stated that "Colonia is to Woodbridge like the Bronx is to NYC. People like the identity."