Bar Harbor is a town on Mount Desert Island in Hancock County, Maine, United States. As of the 2000 census, it population was 4,820. A port of entry for Bay Ferries from Yarmouth, Nova Scotia, Bar Harbor is a famous upper-class 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. At the end of each May, the community hosts The Warblers & Wildflowers Festival.