Madison Avenue is a north-south avenue in the borough of Manhattan in New York City, United States, that carries northbound one-way traffic. It runs from Madison Square (at 23rd Street) to the Madison Avenue Bridge at 138th Street. In doing so, it passes through Midtown, the Upper East Side (including Carnegie Hill), Spanish Harlem, and Harlem. It is named after and arises from Madison Square, which is itself named after James Madison, the fourth President of the United States.