List of United States Senators from Iowa
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Iowa was admitted to the Union on December 28, 1846.
Class 2
| Senator | Party | From | To |
|---|---|---|---|
| George W. Jones | Democrat | 1848 | 1859 |
| James W. Grimes | Republican | 1859 | 1869 |
| James B. Howell | Republican | 1870 | 1871 |
| George G. Wright | Republican | 1871 | 1877 |
| Samuel J. Kirkwood | Republican | 1877 | 1881 |
| James W. McDill | Republican | 1881 | 1883 |
| James F. Wilson | Republican | 1883 | 1895 |
| John H. Gear | Republican | 1895 | 1900 |
| Jonathan P. Dolliver | Republican | 1900 | 1910 |
| Lafayette Young | Republican | 1910 | 1911 |
| William S. Kenyon | Republican | 1911 | 1922 |
| Charles A. Rawson | Republican | 1922 | |
| Smith W. Brookhart | Republican | 1922 | 1926 |
| Daniel F. Steck | Democrat | 1926 | 1931 |
| Lester J. Dickinson | Republican | 1931 | 1937 |
| Clyde L. Herring | Democrat | 1937 | 1943 |
| George A. Wilson | Republican | 1943 | 1949 |
| Guy M. Gillette | Democrat | 1949 | 1955 |
| Thomas E. Martin | Republican | 1955 | 1961 |
| Jack R. Miller | Republican | 1961 | 1973 |
| Richard C. Clark | Democrat | 1973 | 1979 |
| Roger W. Jepsen | Republican | 1979 | 1985 |
| Tom Harkin | Democrat | 1985 |
Class 3
| Senator | Party | From | To |
|---|---|---|---|
| Augustus C. Dodge | Democrat | 1848 | 1855 |
| James Harlan | Whig, Republican | 1855 | 1865 |
| Samuel J. Kirkwood | Republican | 1866 | 1867 |
| James Harlan | Republican | 1867 | 1873 |
| William B. Allison | Republican | 1873 | 1908 |
| Albert B. Cummins | Republican | 1908 | 1926 |
| David W. Stewart | Republican | 1926 | 1927 |
| Smith W. Brookhart | Republican | 1927 | 1933 |
| Richard L. Murphy | Democrat | 1933 | 1936 |
| Guy M. Gillette | Democrat | 1936 | 1945 |
| Bourke B. Hickenlooper | Republican | 1945 | 1969 |
| Harold E. Hughes | Democrat | 1969 | 1975 |
| John C. Culver | Democrat | 1975 | 1981 |
| Charles E. Grassley | Republican | 1981 |