Maryland
- At-large seat: 1963-1967 (obsolete)
- 1st district: 1789–present
- 2nd district: 1789–present
- 3rd district: 1789–present
- 4th district: 1789–present
- 5th district: 1789–present
- 6th district: 1789–1863, 1873-present
- 7th district: 1793–1843, 1953-present
- 8th district: 1793–1835, 1967–present
Read more about this topic: United States Congressional Districts