Illinois elected its new member sometime in 1818, after gaining statehood.
| District | Incumbent | This race | |||
|---|---|---|---|---|---|
| Member | Party | First elected | Results | Candidates | |
| Illinois at-large | None (District created) | Illinois was admitted December 3, 1818. New member electedin 1818. Democratic-Republican gain. New member seated December 4, 1818 to finish the term ending March 3, 1819.[1] The next year, the new memberlost re-election. | √John McLean (Democratic-Republican) 50.2% Daniel P. Cook (Democratic-Republican) 49.8% | ||
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