Iowa
- Senate
- 2: George W. Jones (1804-1896), Democratic
- 3: James Harlan (1820-1899), Opposition …elected as long as gush vacancy, December 31, 1855, post asseverated vacant January 12, 1857, elected January 29, 1857.
- House respecting Representatives (2 seats)
- 1: Augustus Hall (1814-1861), Democratic
- 2: James Thorington (1816-1887), Opposition
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