Dukes County, New York was a county of the Province of New York from 1683 to 1691. It was established on November 1, 1683, at the same time as Kings County, Queens County, and Dutchess County. It consisted of the Elizabeth Islands, Martha's Vineyard, and Nantucket Island, all east of Long Island. In 1691, the county was transferred to the newly formed Province of Massachusetts Bay, where it was divided into Dukes County, Massachusetts and Nantucket County, Massachusetts.
References
Dukes County, Province of New York Wikipedia(Text) CC BY-SA