Riverdale (population: 47,850, according to the 2000 U.S. Census) is an affluent residential neighborhood in the northwest portion of the Bronx in New York City. Riverdale contains the northernmost point in New York City.
Riverdale's ZIP codes are 10463 and 10471. While 10471 is entirely in Riverdale, 10463 also covers the adjacent neighborhoods of Kingsbridge and Marble Hill.
Riverdale was a 19th-century estate district where many of Manhattan's 19th-century moguls built their country estates. At the turn of the century, the new popularity of rail commuting meant that wealthy businessmen made Riverdale their year-round residence. The Fieldston neighborhood, because it is owned by a private association, is a particularly intact example of a turn-of-the century upper class suburb. The Hudson Hill neighborhood retains many of its historic mansions. Riverdale's elite private schools and historic churches also reflect this past.