Perth Amboy is a
city in
Middlesex County,
New Jersey, United States. The City of Perth Amboy is part of the
New York metropolitan area. As of the
2010 United States Census, the city's population was 50,814, reflecting an increase of 3,511 (+7.4%) from the 47,303 counted in the
2000 Census, which had in turn increased by 5,336 (+12.7%) from the 41,967 counted in the
1990 Census. Perth Amboy is known as the "City by the Bay," referring to
Raritan Bay.