Perth Amboy is a city in northeastern Middlesex County, in the U.S. state of New Jersey, within the New York metropolitan area. As of the 2020 United States census, the city's population was 55,436. Perth Amboy is known as the "City by the Bay", referring to its location adjoining Raritan Bay.
The earliest residents of the area were the Lenape Native Americans, who called the point on which the city lies "Ompoge". Perth Amboy was settled in 1683 by Scottish colonists and was called "New Perth" after James Drummond, 4th Earl of Perth; the native name was eventually corrupted and the two names were merged. Perth Amboy was formed by Royal charter in 1718, and the New Jersey Legislature reaffirmed its status in 1784, after independence.