| Name | Held Office | Political Party |
|---|---|---|
| George L. Shoup | 1890 Dec 19, 1890 |
Republican |
| N. B. Willey | Dec 19, 1890 Jan 1, 1893 |
Republican |
| William J. McConnell | Jan 1, 1893 Jan 4, 1897 |
Republican |
| Frank Steunenberg | Jan 4, 1897 Jan 7, 1901 |
Democratic |
| Frank W. Hunt | Jan 7, 1901 Jan 5, 1903 |
Democratic |
| John T. Morrison | Jan 5, 1903 Jan 3, 1905 |
Republican |
| Frank R. Gooding | Jan 3, 1905 Jan 4, 1909 |
Republican |
| James H. Brady | Jan 4, 1909 Jan 2, 1911 |
Republican |
| James H. Hawley | Jan 2, 1911 Jan 6, 1913 |
Democratic |
| John M. Haines | Jan 6, 1913 Jan 4, 1915 |
Republican |
| Moses Alexander | Jan 4, 1915 Jan 6, 1919 |
Democratic |
| D. W. Davis | Jan 6, 1919 Jan 3, 1923 |
Republican |
| Charles C. Moore | Jan 3, 1923 Jan 3, 1927 |
Republican |
| H. C. Baldridge | Jan 3, 1927 Jan 5, 1931 |
Republican |
| C. Ben Ross | Jan 5, 1931 Jan 4, 1937 |
Democratic |
| Barzilla W. Clark | Jan 4, 1937 Jan 2, 1939 |
Democratic |
| Chase A. Clark | Jan 6, 1941 Jan 4, 1943 |
Democratic |
| C. A. Bottolfsen | Jan 4, 1943 Jan 1, 1945 |
Republican |
| Charles C. Gossett | Jan 1, 1945 Nov 17, 1945 |
Democratic |
| Arnold Williams | Nov 17, 1945 Jan 6, 1947 |
Democratic |
| C. A. Robins | Jan 6, 1947 Jan 1, 1951 |
Republican |
| Len B. Jordan | Jan 1, 1951 Jan 3, 1955 |
Republican |
| Robert E. Smylie | Jan 3, 1955 Jan 2, 1967 |
Republican |
| Don Samuelson | Jan 2, 1967 Jan 4, 1971 |
Republican |
| John V. Evans | Jan 24, 1977 Jan 5, 1987 |
Democratic |
| Cecil D. Andrus | Jan 5, 1987 Jan 2, 1995 |
Democratic |
| Phil Batt | Jan 2, 1995 Jan 8, 1999 |
Republican |
| Dirk Kempthorne | Jan 8, 1999 May 26, 2006 |
Republican |
| Jim Risch | May 26, 2006 Jan 1, 2007 |
Republican |
| C.L. Otter | Jan 1, 2007 Incumbent |
Republican |
