Mount Desert Island (often abbreviated MDI), in Hancock County, Maine, is the largest island off the coast of Maine. With an area of it is the 6th largest island in the contiguous United States. It is the second-largest island on the Eastern seaboard, behind Long Island and ahead of Martha's Vineyard. The island has a year-round population of approximately 10,000, although it is estimated that two and a half million tourists a year visit Acadia National Park on the island. The island is home to numerous well-known summer colonies such as Northeast Harbor and Bar Harbor. Current notable summer residents include George Mitchell, Tim Robbins, David Rockefeller, Susan Sarandon, and Martha Stewart.