States in the Senate | Wisconsin Senators
| CONGRESS | SENATOR | TERM BEGAN | TERM ENDED | COMMENTS |
|---|---|---|---|---|
| Class 1 | ||||
| 30th-34th | Henry Dodge (D) | Jun. 8, 1848 | Mar. 3, 1857 | |
| 35th-40th | James R. Doolittle (R) | Mar. 4, 1857 | Mar. 3, 1869 | |
| 41st-43rd | Matthew H. Carpenter (R) | Mar. 4, 1869 | Mar. 3, 1875 | |
| 44th-46th | Angus Cameron (R) | Mar. 4, 1875 | Mar. 3, 1881 | |
| 47th-52nd | Philetus Sawyer (R) | Mar. 4, 1881 | Mar. 3, 1893 | |
| 53rd-55th | John L. Mitchell (D) | Mar. 4, 1893 | Mar. 3, 1899 | |
| 56th-58th | Joseph V. Quarles (R) | Mar. 4, 1899 | Mar. 3, 1905 | |
| 59th-69th | Robert M. La Follette (R) | Jan. 4, 19061 | Jun. 18, 1925 | Died |
| 69th-79th | Robert M. La Follette, Jr. (R) | Sept. 30, 1925 | Jan. 3, 1947 | |
| 80th-85th | Joseph R. McCarthy (R) | Jan. 3, 1947 | May 2, 1957 | Died |
| 85th-100th | William Proxmire (D) | Aug. 28, 1957 | Jan. 3, 1989 | |
| 101st-112th | Herbert H. Kohl (D) | Jan. 3, 1989 | Jan. 3, 2013 | |
| 113th- | Tammy Baldwin (D) | Jan. 3, 2013 | Present | |
| Class 3 | ||||
| 30th-33rd | Isaac P. Walker (D) | Jun. 8, 1848 | Mar. 3, 1855 | |
| 34th-36th | Charles Durkee (R, OP) | Mar. 4, 1855 | Mar. 3, 1861 | |
| 37th-45th | Timothy O. Howe (R) | Mar. 4, 1861 | Mar. 3, 1879 | |
| 46th | Matthew H. Carpenter (R) | Mar. 4, 1879 | Feb. 24, 1881 | Died |
| 47th-48th | Angus Cameron (R) | Mar. 14, 1881 | Mar. 3, 1885 | |
| 49th-51st | John C. Spooner (R) | Mar. 4, 1885 | Mar. 3, 1891 | |
| 52nd-54th | William F. Vilas (D) | Mar. 4, 1891 | Mar. 3, 1897 | |
| 55th-59th | John C. Spooner (R) | Mar. 4, 1897 | Apr. 30, 1907 | Resigned |
| 59th-63rd | Isaac Stephenson (R) | May 17, 1907 | Mar. 3, 1915 | |
| 64th-65th | Paul O. Husting (D) | Mar. 4, 1915 | Oct. 21, 1917 | Died |
| 65th-69th | Irvine L. Lenroot (R) | Apr. 18, 1918 | Mar. 3, 1927 | |
| 70th-72nd | John J. Blaine (R) | Mar. 4, 1927 | Mar. 3, 1933 | |
| 73rd-75th | Francis R. Duffy (D) | Mar. 4, 1933 | Jan. 3, 1939 | |
| 76th-87th | Alexander Wiley (R) | Jan. 3, 1939 | Jan. 3, 1963 | |
| 88th-96th | Gaylord A. Nelson (D) | Jan. 8, 19632 | Jan. 3, 1981 | |
| 97th-102nd | Robert W. Kasten, Jr. (R) | Jan. 3, 1981 | Jan. 3, 1993 | |
| 103rd-111th | Russell D. Feingold (D) | Jan. 3, 1993 | Jan. 3, 2011 | |
| 112th- | Ron Johnson (R) | Jan. 3, 2011 | Present | |
1. Elected to term beginning Mar. 4, 1905. Continued to serve as governor before taking senate seat.
2. Elected to term beginning Jan. 3, 1963. Continued to serve as governor before taking senate seat.
