| Class 2 Senators | Congress | Class 3 Senators |
|---|---|---|
| George W. Jones (D) | 30th (1847–1849) | Augustus C. Dodge (D) |
| 31st (1849–1851) | ||
| 32nd (1851–1853) | ||
| 33rd (1853–1855) | ||
| 34th (1855–1857) | James Harlan (R) | |
| 35th (1857–1859) | ||
| James W. Grimes (R) | 36th (1859–1861) | |
| 37th (1861–1863) | ||
| 38th (1863–1865) | ||
| 39th (1865–1867) | ||
| Samuel J. Kirkwood (R) | ||
| 40th (1867–1869) | James Harlan (R) | |
| 41st (1869–1871) | ||
| James B. Howell (R) | ||
| George G. Wright (R) | 42nd (1871–1873) | |
| 43rd (1873–1875) | William B. Allison (R) | |
| 44th (1875–1877) | ||
| Samuel J. Kirkwood (R) | 45th (1877–1879) | |
| 46th (1879–1881) | ||
| 47th (1881–1883) | ||
| James W. McDill (R) | ||
| James F. Wilson (R) | 48th (1883–1885) | |
| 49th (1885–1887) | ||
| 50th (1887–1889) | ||
| 51st (1889–1891) | ||
| 52nd (1891–1893) | ||
| 53rd (1893–1895) | ||
| John H. Gear (R) | 54th (1895–1897) | |
| 55th (1897–1899) | ||
| 56th (1899–1901) | ||
| Jonathan P. Dolliver (R) | ||
| 57th (1901–1903) | ||
| 58th (1903–1905) | ||
| 59th (1905–1907) | ||
| 60th (1907–1909) | ||
| Albert B. Cummins (R) | ||
| 61st (1909–1911) | ||
| Lafayette Young (R) | ||
| 62nd (1911–1913) | ||
| William S. Kenyon (R) | ||
| 63rd (1913–1915) | ||
| 64th (1915–1917) | ||
| 65th (1917–1919) | ||
| 66th (1919–1921) | ||
| 67th (1921–1923) | ||
| Charles A. Rawson (R) | ||
| Smith W. Brookhart (R) | ||
| 68th (1923–1925) | ||
| 69th (1925–1927) | ||
| Daniel F. Steck (D) | David W. Stewart (R) | |
| 70th (1927–1929) | Smith W. Brookhart (R) | |
| 71st (1929–1931) | ||
| L. J. Dickinson (R) | 72nd (1931–1933) | |
| 73rd (1933–1935) | Richard Louis Murphy (D) | |
| 74th (1935–1937) | ||
| Guy M. Gillette (D) | ||
| Clyde L. Herring (D) | 75th (1937–1939) | |
| 76th (1939–1941) | ||
| 77th (1941–1943) | ||
| George A. Wilson (R) | 78th (1943–1945) | |
| 79th (1945–1947) | Bourke B. Hickenlooper (R) | |
| 80th (1947–1949) | ||
| Guy M. Gillette (D) | 81st (1949–1951) | |
| 82nd (1951–1953) | ||
| 83rd (1953–1955) | ||
| Thomas E. Martin (R) | 84th (1955–1957) | |
| 85th (1957–1959) | ||
| 86th (1959–1961) | ||
| Jack R. Miller (R) | 87th (1961–1963) | |
| 88th (1963–1965) | ||
| 89th (1965–1967) | ||
| 90th (1967–1969) | ||
| 91st (1969–1971) | Harold E. Hughes (D) | |
| 92nd (1971–1973) | ||
| Richard C. Clark (D) | 93rd (1973–1975) | |
| 94th (1975–1977) | John C. Culver (D) | |
| 95th (1977–1979) | ||
| Roger W. Jepsen (R) | 96th (1979–1981) | |
| 97th (1981–1983) | Charles Grassley (R) | |
| 98th (1983–1985) | ||
| Tom Harkin (D) | 99th (1985–1987) | |
| 100th (1987–1989) | ||
| 101st (1989–1991) | ||
| 102nd (1991–1993) | ||
| 103rd (1993–1995) | ||
| 104th (1995–1997) | ||
| 105th (1997–1999) | ||
| 106th (1999–2001) | ||
| 107th (2001–2003) | ||
| 108th (2003–2005) | ||
| 109th (2005–2007) | ||
| 110th (2007–2009) |
The Iowa Territory was the "Iowa District" of western Wisconsin Territory the region west of the Mississippi River. The original boundaries of the territory, as established in 1838, included part of Minnesota and parts of the Dakotas, covering about of land.
| Delegate | Years | Party |
|---|---|---|
| William W. Chapman | September 10, 1838 – October 27, 1840 | Democratic |
| Augustus C. Dodge | October 28, 1840 – December 28, 1846 | Democratic |