Maine alone has more island runs than most countries, and the boat is the road for the communities at the end of them.
| Portland–Peaks Island ferry: the crossing that carries cars | Vehicle ferry | 17 minutes |
| Stonington–Isle au Haut ferry: the mailboat with two island landings | Island service | About 45 minutes |
| Winter Harbor–Bar Harbor ferry: a seasonal run across Frenchman Bay | Seasonal service | About 45 minutes |