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Westchester County is a county located in the U.S. state of New York. Westchester covers an area of 450 square miles (1,200 km2) and has a population of 949,113 according to the 2010 Census, residing in 45 municipalities. It was named after the city of Chester in England, and the county seat is White Plains. List of Populated Places in Westchester County Cities Yonkers , founded in 1646 N...