Yorkville is a neighborhood on the Upper East Side of Manhattan, New York City, United States. Its southern boundary is East 79th Street, its northern East 96th Street, its western Third Avenue, and its eastern the East River. Yorkville is one of the most densely populated city subdivisions in the world.

The Upper East Side, sometimes abbreviated UES, is a neighborhood in the borough of Manhattan in New York City, bounded approximately by 96th Street to the north, the East River to the east, 59th Street to the south, and Central Park and Fifth Avenue to the west. The area incorporates several smaller neighborhoods, including Lenox Hill, Carnegie Hill, and Yorkville. Once known as the Silk Stocking District, it has long been the most affluent neighborhood in New York City.