New Castle is a town in Westchester County, New York, United States. The population was 17,569 at the 2010 census. It includes the hamlets of Chappaqua and Millwood History. New Castle was originally ... Portions of the Town of New Castle fall within the ZIP codes and school districts of Armonk, Briarcliff Manor, Mount Kisco, Ossining, ...

New Rochelle (/ ˌ n ɜː r ə ˈ ʃ ɛ l /; older French: La Nouvelle-Rochelle) is a city in Westchester County, New York, United States, in the southeastern portion of the state. In 2020, the city had a population of 79,726, making it the seventh-largest in the state of New York.Some residents refer to the city as New Rock or New Rock City