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Edgartown, town (township), seat of Dukes county, southeastern Massachusetts, U.S. The town comprises Chappaquiddick Island and the eastern tip of the island of Martha’s Vineyard. The oldest settlement on the island, Edgartown dates from 1642 and was incorporated in 1671 and named for Edgar, son of James II of England; the town had previously been called Nunnepog (Algonquian for “Fresh Pond”). In the 18th century Edgartown was the prosperous home port of many whaling vessels....