Illinois
- Senate
- 2: Jesse B. Thomas (1777-1853), Democratic-Republican …newly assured state, elected December 3, 1818.
- 3: Ninian Edwards (1775-1833), Democratic-Republican …newly authenticated state, elected December 3, 1818.
- House speaking of Representatives (1 seat)
- A/L: John McLean (1791-1830), Democratic-Republican …newly certified state, situated December 4, 1818.
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