The New England Commonwealth was one of the thirteen commonwealths of the pre-war United States of America. Created in the early 21st century, it was comprised of the former states of Maine, New Hampshire, Vermont, Massachusetts, Rhode Island and Connecticut.
When hit by the bombs in 2077, the state was downed but not out. The Institute of the Commonwealth, believed to be founded by Massachusetts Institute Of Technology staff at the time of the Great War, swooped into action and made state-of-the-art space-age technology, and even androids. They used their technology to save the Massachusetts Wasteland and improve life there.
- The Commonwealth (mentioned in Fallout 3)
- The Commonwealth (mentioned in Fallout: New Vegas by Ulysses)