MA 6 Thachers Island latitude 42° 38' 20.8" N longitude 70° 34' 28.7" W Thacher Island Campground & Lighthouse (circa 1771) P.O. Box 73, Rockport, MA 01966, (617) 599-2590 Harbor Tours Inc. of Cape Ann, out of Gloucester, offers a Lighthouse Cruise that passes by the island. ARLHS # USA-1027
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