| Name | Held Office | Political Party |
|---|---|---|
| Nelson Dewey | Jun 7, 1848 Jan 5, 1852 |
Democratic |
| Leonard J. Farwell | Jan 5, 1852 Jan 2, 1854 |
Whig |
| William A. Barstow | Jan 2, 1854 Mar 21, 1856 |
Democratic |
| Arthur MacArthur, Sr. | Mar 21, 1856 Mar 25, 1856 |
Democratic |
| Coles Bashford | Mar 25, 1856 Jan 4, 1858 |
Republican |
| Alexander W. Randall | Jan 4, 1858 Jan 6, 1862 |
Republican |
| Louis P. Harvey | Jan 6, 1862 Apr 19, 1862 |
Republican |
| Edward Salomon | Apr 19, 1862 Jan 4, 1864 |
Republican |
| James T. Lewis | Jan 4, 1864 Jan 1, 1866 |
Republican |
| Lucius Fairchild | Jan 1, 1866 Jan 1, 1872 |
Republican |
| Cadwallader C. Washburn | Jan 1, 1872 Jan 5, 1874 |
Republican |
| William Robert Taylor | Jan 5, 1874 Jan 3, 1876 |
Democratic |
| Harrison Ludington | Jan 3, 1876 Jan 7, 1878 |
Republican |
| William E. Smith | Jan 7, 1878 Jan 2, 1882 |
Republican |
| Jeremiah McLain Rusk | Jan 2, 1882 Jan 7, 1889 |
Republican |
| William D. Hoard | Jan 7, 1889 Jan 5, 1891 |
Republican |
| George W. Peck | Jan 5, 1891 Jan 7, 1895 |
Democratic |
| William H. Upham | Jan 7, 1895 Jan 4, 1897 |
Republican |
| Edward Scofield | Jan 4, 1897 Jan 7, 1901 |
Republican |
| Robert M. La Follette, Sr. | Jan 7, 1901 Jan 1, 1906 |
Republican |
| James O. Davidson | Jan 1, 1906 Jan 2, 1911 |
Republican |
| Francis E. McGovern | Jan 2, 1911 Jan 4, 1915 |
Republican |
| Emanuel L. Philipp | Jan 4, 1915 Jan 3, 1921 |
Republican |
| John J. Blaine | Jan 3, 1921 Jan 3, 1927 |
Republican |
| Fred R. Zimmerman | Jan 3, 1927 Jan 7, 1929 |
Republican |
| Walter J. Kohler, Sr. | Jan 7, 1929 Jan 5, 1931 |
Republican |
| Albert G. Schmedeman | Jan 2, 1933 Jan 7, 1935 |
Democratic |
| Philip La Follette | Jan 7, 1935 Jan 2, 1939 |
Progressive |
| Julius P. Heil | Jan 2, 1939 Jan 4, 1943 |
Republican |
| Walter S. Goodland | Jan 4, 1943 Mar 12, 1947 |
Republican |
| Oscar Rennebohm | Mar 12, 1947 Jan 1, 1951 |
Republican |
| Walter J. Kohler, Jr. | Jan 1, 1951 Jan 7, 1957 |
Republican |
| Vernon W. Thomson | Jan 7, 1957 Jan 5, 1959 |
Republican |
| Gaylord A. Nelson | Jan 5, 1959 Jan 7, 1963 |
Democratic |
| John W. Reynolds | Jan 7, 1963 Jan 4, 1965 |
Democratic |
| Warren P. Knowles | Jan 4, 1965 Jan 4, 1971 |
Republican |
| Patrick J. Lucey | Jan 4, 1971 Jul 6, 1977 |
Democratic |
| Martin J. Schreiber | Jul 6, 1977 Jan 3, 1979 |
Democratic |
| Lee S. Dreyfus | Jan 3, 1979 Jan 3, 1983 |
Republican |
| Anthony S. Earl | Jan 3, 1983 Jan 5, 1987 |
Democratic |
| Tommy Thompson | Jan 5, 1987 Feb 1, 2001 |
Republican |
| Scott McCallum | Feb 1, 2001 Jan 6, 2003 |
Republican |
| Jim Doyle | Jan 6, 2003 Jan 3, 2011 |
Democratic |
| Scott Walker | Jan 3, 2011 Incumbent |
Republican |
