Bar Harbor is a town on Mount Desert Islan in Hancock County, Maine, United States. As of the 2000 census, its population was 4,820. A port of entry for Bay Ferries from Yarmouth, Nova Scotia, Bar Harbor is a famous summer colony in the Down East region of Maine. It is home to the College of the Atlantic, Jackson Laboratory and Mount Desert Island Biological Laboratory. Bar Harbor is home to the largest parts of Acadia National Park, including Cadillac Mountain the highest point within 25 miles (40 km) of the coastline of the Eastern United States.