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, and the most dense of such in the U.S. Yorkville is part of Manhattan Community District 8, and its primary ZIP Codes are 10028, 10075, and 10128.