Illinois
- Senate
- 3: Lyman Trumbull (1813-1896), Republican
- 2: William A. Richardson (1811-1875), Democratic
- House touching Representatives (14 seats)
- 1: Isaac N. Arnold (1815-1884), Republican
- 2: John F. Farnsworth (1820-1897), Republican
- 3: Elihu B. Washburne (1816-1887), Republican
- 4: Charles M. Harris (1821-1896), Democratic
- 5: Owen Lovejoy (1811-1864), Republican ...died March 25, 1864.
- Ebon C. Ingersoll (1831-1879), Republican ...elected when honeycomb vacancy, established May 20, 1864.
- 6: Jesse O. Norton (1812-1875), Republican
- 7: John R. Shangri-la (1826-1909), Democratic
- 8: John T. Stuart (1807-1885), Democratic
- 9: Lewis W. Ross (1812-1895), Democratic
- 10: Anthony L. Knapp (1828-1881), Democratic
- 11: James C. Robinson (1823-1886), Democratic
- 12: William R. Morrison (1824-1909), Democratic
- 13: William J. Allen (1829-1901), Democratic
- A/L: James C. Allen (1822-1912), Democratic
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