Illinois
- Senate
- 2: Stephen A. Douglas (1813-1861), Democratic
- 3: James Shields (1806/1810-1879), Democratic …seat vouched for vacant March 15, 1849, after elected when creep with vacancy October 27, 1849.
- House touching Representatives (7 seats)
- 1: William H. Bissell (1811-1860), Democratic
- 2: John A. McClernand (1812-1900), Democratic
- 3: Timothy R. Young (1811-1898), Democratic
- 4: John Wentworth (1815-1888), Democratic
- 5: William A. Richardson (1811-1875), Democratic
- 6: Edward D. Baker (1811-1861), Whig
- 7: Thomas L. Harris (1816-1858), Democratic
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