Illinois
- Senate
- 2: Stephen A. Douglas (1813-1861), Democratic
- 3: Lyman Trumbull (1813-1896), Republican
- House upon
Representatives (9 seats)
- 1: Elihu B. Washburne (1816-1887), Republican
- 2: John F. Farnsworth (1820-1897), Republican
- 3: Owen Lovejoy (1811-1864), Republican
- 4: William Kellogg (1814-1872), Republican
- 5: Isaac N. Morris (1812-1879), Democratic
- 6: Thomas L. Harris (1816-1858), Democratic …died November 24, 1858.
- 6: John A. McClernand (1812-1900), Democratic …elected as long as flow vacancy excluding precedence Congress, established December 5, 1859.
- 7: James C. Robinson (1823-1886), Democratic
- 8: Philip B. Fouke (1818-1876), Democratic
- 9: John A. Logan (1826-1886), Democratic
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