Chebeague Island is an island town in Cumberland County, Maine, United States, located in Casco Bay, 10 miles from Portland. These islands are sometimes referred to as an older, now archaic term "The Calendar Islands" because there was once a belief that the approx. number of islands is about 365. See Casco Bay. The actual number is less than two hundred. Great Chebeague was a part of the town of Cumberland until July 1, 2007, when it became the town of Chebeague Island. Two ferry services provide transportation to the island. The Chebeague Transportation Company (CTC) makes the 15 minute run from Cousins Island, which in turn is connected by bridge to Yarmouth. Casco Bay Lines also provides service on all mail-boat and other "down-bay" trips that travel beyond Long Island.