Marble Hill became an island in the Harlem River when it was separated from the island of Manhattan by the construction of the Harlem Ship Canal in 1895. In 1914, the Harlem River was filled in on the north side of Marble Hill, connecting it to the North American mainland and the Bronx. Because of this change in geography, Marble Hill is often associated with the Bronx and is part of Bronx Community District 8. In addition, Marble Hill has a Bronx ZIP Code of 10463 and is patrolled by the New York City Police Department's 50th Precinct, headquartered in the Bronx.