New Castle is a town in Westchester County, New York, United States. The population was 18,311 in the 2020 United States census, an increase over 17,569 at the 2010 census. It includes the named hamlets of Chappaqua and Millwood, but residents and businesses in the Town of New Castle can also have a designated city address of Ossining, or Millwood as well as Chappaqua or even Mt. Kisco.

Bedford is an incorporated town in Westchester County, New York. The population was 16,880 at the 2020 census.