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Jefferson Valley is located in Yorktown, NY in Westchester County. The town is named after the Battle of Yorktown, which was near Yorktown, Virginia. The town of Yorktown has a splendid historical heritage beginning with the earliest known inhabitants: Mohegan, Osceola, Amwalk, Kitchawan and Mohansic, which are all familiar names of local places. The Mohegans of the Algonquin Nation had habitations within the boundary of Yorktown. Jefferson Valley is located in this beautiful, historic town!