Ferries

Maine State Ferry Service
Provides service from Rockland to the islands of Vinalhaven, North Haven, and Matinicus; from Lincolnville to Isleboro; and from Bass Harbor to Swans Island and Frenchboro.
Quoddy Loop Ferry Services
Provides transit between Maine and the Quoddy Loop Islands: Campobello Island, Deer Island, Grand Manan, White Head Island, and Eastport (Moose Island), as well as the mainland of New Brunswick.
Casco Bay Lines
Provides transit between Casco Bay, near Portland, and offshore islands .
The Cat
Service from Bar Harbor and Portland to Nova Scotia.
Chebeague Transportation Company
Service between Cousins Island in Yarmouth and Chebeague Island in Casco Bay.
Isle au Haut Boat Company
Service between Stonington and Isle au Haut.
Monhegan Boat Line
Service from Port Clyde to the island of Monhegan.