| Official Name: | Marshall Island, Maine |
| Settlement Type: | Unorganized territory |
| Pushpin Map: | Maine |
| Pushpin Label Position: | left |
| Pushpin Map Caption: | Location within the state of Maine |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Maine |
| Subdivision Type2: | County |
| Subdivision Name2: | Hancock |
| Unit Pref: | Imperial |
| Area Total Km2: | 14.1 |
| Area Land Km2: | 4.1 |
| Area Water Km2: | 10.1 |
| Area Total Sq Mi: | 5.5 |
| Area Land Sq Mi: | 1.6 |
| Area Water Sq Mi: | 3.9 |
| Population As Of: | 2020 |
| Population Total: | 0 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Coordinates: | 44.114°N -68.507°W |
| Postal Code Type: | ZIP code |
| Area Code: | 207 |
| Blank Name: | FIPS code |
| Blank Info: | 23-43578 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2378263 |
Marshall Island is an island and unorganized territory in Hancock County, Maine, United States. It lies where Penobscot Bay and Blue Hill Bay meet, between Swan's Island and Isle au Haut. Uninhabited, it is one of the largest undeveloped islands surrounding the contiguous United States.
Development of the island was explored in the 1980s, with wells drilled for 14 potential properties, but these plans fell through due to a weak real estate market. The island was purchased in three parcels by the Maine Coast Heritage Trust in 2003 and 2004 for a total cost of $6.3 million.[1]
According to the United States Census Bureau, the unorganized territory has a total area of 5.5 square miles (14.1 km2), of which 1.6 square miles (4.1 km2) is land and 3.9 square miles (10.1 km2) is water (71%).[2]
Covering 985 acres, Marshall Island is the 11th largest island in Maine. It is almost entirely forested, apart from a pair of discontinued runways. While it has a primarily rocky coast, it also has more than ten beaches, the largest of which is located on the southeastern side of the island in Sand Cove.[3]
Maine Coast Heritage Trust has turned the island into Ed Woodsum Preserve, which is open to the public. The land trust has campsites available on the island, and maintains hiking trails that surround and cross the island. It also advertises the island as an ideal location for boating, birdwatching and swimming at its sandy beaches. The island is also open to hunting and fishing.[3]