<Tr> <Th> ZIP Codes </Th> <Td> 10021, 10028, 10029, 10065, 10075, 10128 </Td> </Tr> <Tr> <Th> Area code (s) </Th> <Td> 212, 917, 646 </Td> </Tr> <P> The Upper East Side is a neighborhood in the borough of Manhattan in New York City, between Central Park / Fifth Avenue, 59th Street, the East River, and 96th Street . The area incorporates several smaller neighborhoods, including Lenox Hill, Carnegie Hill, and Yorkville . Once known as the Silk Stocking District, it is now one of the most affluent neighborhoods in New York City . </P> <P> Before the arrival of Europeans, the mouths of streams that eroded gullies in the East River bluffs are conjectured to have been the sites of fishing camps used by the Lenape, whose controlled burns once a generation or so kept the dense canopy of oak--hickory forest open at ground level . </P>

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