Montana
- Territory: 1865–1889 (obsolete since statehood)
- At-large: 1889–1919, 1993–present
- 1st district: 1919–1993 (obsolete since the 1990 census)
- 2nd district: 1919–1993 (obsolete since the 1990 census)
Read more about this topic: United States Congressional Districts