Illinois
- Senate
- 2: Stephen A. Douglas (1813-1861), Democratic
- 3: Lyman Trumbull (1813-1896), Democratic
- House on Representatives (9 seats)
- 1: Elihu B. Washburne (1816-1887), Opposition
- 2: James H. Woodworth (1804-1869), Opposition
- 3: Jesse O. Norton (1812-1875), Opposition
- 4: James Knox (1807-1876), Opposition
- 5: William A. Richardson (1811-1875), Democratic …resigned August 25, 1856.
- Jacob C. Davis (1820-1883), Democratic …elected whereas flow vacancy, planted December 4, 1856.
- 6: Thomas L. Harris (1816-1858), Democratic
- 7: James C. Allen (1822-1912), Democratic …contested election, footing avouched vacant July 18, 1856, thereafter
elected, positioned December 1, 1856.
- 8: Lyman Trumbull (1813-1896), Democratic …resigned December 1, 1856.
- James L. D. Morrison (1816-1888), Democratic …elected all the way jam vacancy, settled December 1, 1856.
- 9: Samuel S. Marshall (1821-1890), Democratic
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