Staten Island is the southernmost borough of New York City, coextensive with
Richmond County and situated at the southern tip of the U.S. state of New York. The borough is separated from the adjacent state of New Jersey by the Arthur Kill and the Kill Van Kull and from the rest of New York by New York Bay. With a population of 495,747 in the 2020 Census, Staten Island is the least populated New York City borough but the third largest in land area at 58.5 sq mi (152 km
2); it is also the least densely populated and most suburban borough in the city.