If you want to learn about the city's history and population, read our article on the history of the island, Population & Steets in Great Dimond Island City. You'll also find other information on the island. Despite being part of the city of Portland, Maine, the island is accessible only by boat. Its population is approximately 77 people year-round. The island is located in Casco Bay and has a small network of roads. During World War II, Great Diamond Island served as a military base, and was abandoned for thirty years. The area was revitalized in the late 1960s, when the town grew into a thriving community.
- Home >
- States >
- Maine >
- Great Diamond Island