Deer Isle is accessible via several winding country roads that split off of U.S. Route 1. Coming from the south or west (Portland or Camden), turn onto Route 175 in Orland, then connect to Route 15 and continue to Deer Isle. From the east (that is, Bar Harbor), head south on Route 172 to Blue Hill, where you can also pick up Route 15. Deer Isle is connected to the mainland via a high, narrow, and graceful suspension bridge, built in 1938 -- still a bit harrowing to cross in high winds.
The Deer Isle-Stonington Chamber of Commerce (tel. 207/348-6124), staffs a seasonal information booth just beyond the bridge on Little Deer Isle. The booth is normally open daily in summer, its hours dependant on volunteer availability.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.