The Bronx is one of the five boroughs of New York City. The city's northern most borough, it is the only one that is part of the mainland United States and not situated on an island.
The borough of The Bronx is coterminous with Bronx County, with a population of 1.35 million. While the official borough name is The Bronx, the official county name is simply Bronx without the definite article.

Named for Jonas Bronck a Swedish sea captain and 1641 resident whose 500-acre (2 km˛) farm between the Harlem River and the Aquahung composes part of the modern borough, The Bronx is the fourth most populous of New York City's five boroughs. Bronx county is the fifth most populous county in the New York Metropolitan Area.