Northern Commonwealth

The  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 Montana, Wyoming, North Dakota and South Dakota.

Montana may have not been hit as much as other states during the Great War because you learn in a conversation with the The Lonesome Drifter that coal mines are still active in the state.

Appearances
The North Commonwealth does not appear in any released Fallout games.