Page "Westchester County, New York" Paragraph 8

Westchester County was an original county of the Province of New York, one of twelve created by an act of the New York General Assembly in 1683.

At the time it also included present day Bronx County, which constituted the original Town of Westchester ( the center of which was around the area today known as Westchester Square, in the Bronx ) and portions of Yonkers, Eastchester, and Pelham.