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Class 1
Class 1 U.S. Senators belong to the electoral cycle that has recently been contested in 1994, 2000, 2006, and 2012. The next election will be in 2018. |
C o n g r e s s |
Class 3
Class 3 U.S. Senators belong to the electoral cycle that has recently been contested in 1998, 2004, 2010, and 2016. The next election will be in 2022. |
| # |
Senator |
Party |
Years in office |
Electoral history |
T e r m |
T e r m |
Electoral history |
Years in office |
Party |
Senator |
# |
| Vacant |
May 29, 1848 – June 8, 1848 |
Wisconsin elected its Senators 10 days after statehood. |
1 |
30th Congress |
1 |
Wisconsin elected its Senators 10 days after statehood. |
May 29, 1848 – June 8, 1848 |
Vacant |
| 1 |
 Henry Dodge |
Democratic |
June 8, 1848 – March 4, 1857 |
Elected in 1848. |
Elected in 1848. |
June 8, 1848 – March 4, 1855 |
Democratic |
 Isaac P. Walker |
1 |
| 31st Congress |
2 |
Re-elected in 1849.
Retired. |
Re-elected in 1851.
Retired. |
2 |
32nd Congress |
| 33rd Congress |
| 34th Congress |
3 |
Elected in 1854.
[Data unknown/missing. You can help!] |
March 4, 1855 – March 4, 1861 |
Republican |
 Charles Durkee |
2 |
| 2 |
 James R. Doolittle |
Republican |
March 4, 1857 – March 4, 1869 |
Elected in 1857. |
3 |
35th Congress |
| 36th Congress |
| 37th Congress |
4 |
Elected in 1861. |
March 4, 1861 – March 4, 1879 |
Republican |
 Timothy O. Howe |
3 |
Re-elected in 1863.
[Data unknown/missing. You can help!] |
4 |
38th Congress |
| 39th Congress |
| 40th Congress |
5 |
Re-elected in 1866. |
| 3 |
 Matthew H. Carpenter |
Republican |
March 4, 1869 – March 4, 1875 |
Elected in 1868 or 1869.
Lost re-election. |
5 |
41st Congress |
| 42nd Congress |
| 43rd Congress |
6 |
Re-elected in 1872.
Lost re-election. |
| 4 |
 Angus Cameron |
Republican |
March 4, 1875 – March 4, 1881 |
Elected in 1875.
Retired. |
6 |
44th Congress |
| 45th Congress |
| 46th Congress |
7 |
Elected in 1879.
Died. |
March 4, 1879 – February 24, 1881 |
Republican |
 Matthew H. Carpenter |
4 |
| |
February 24, 1881 – March 14, 1881 |
Vacant |
| 5 |
 Philetus Sawyer |
Republican |
March 4, 1881 – March 4, 1893 |
Elected in 1881. |
7 |
47th Congress |
Elected to finish Carpenter's term.
Retired. |
March 14, 1881 – March 4, 1885 |
Republican |
 Angus Cameron |
5 |
| 48th Congress |
| 49th Congress |
8 |
Elected in 1885.
Lost re-election. |
March 4, 1885 – March 4, 1891 |
Republican |
 John Coit Spooner |
6 |
Re-elected in 1887.
Retired. |
8 |
50th Congress |
| 51st Congress |
| 52nd Congress |
9 |
Elected in 1890.
Lost renomination. |
March 4, 1891 – March 4, 1897 |
Democratic |
 William F. Vilas |
7 |
| 6 |
 John L. Mitchell |
Democratic |
March 4, 1893 – March 4, 1899 |
Elected in 1893.
Retired. |
9 |
53rd Congress |
| 54th Congress |
| 55th Congress |
10 |
Elected January 26, 1897.[1] |
March 4, 1897 – April 30, 1907 |
Republican |
 John Coit Spooner |
8 |
| 7 |
 Joseph V. Quarles |
Republican |
March 4, 1899 – March 4, 1905 |
Elected in 1899.
Retired. |
10 |
56th Congress |
| 57th Congress |
| 58th Congress |
11 |
Re-elected in 1903.
Resigned. |
| Vacant |
March 4, 1905 – January 2, 1906 |
|
11 |
59th Congress |
| 8 |
 Robert M. La Follette, Sr. |
Republican |
January 2, 1906 – June 18, 1925 |
Elected late in 1905. |
| 60th Congress |
| |
April 30, 1907 – May 17, 1907 |
Vacant |
| Elected to finish Spooner's term. |
May 17, 1907 – March 4, 1915 |
Republican |
 Isaac Stephenson |
9 |
| 61st Congress |
12 |
Re-elected in 1909.
Retired. |
| Re-elected in 1911. |
12 |
62nd Congress |
| 63rd Congress |
| 64th Congress |
13 |
Elected in 1914.
Died. |
March 4, 1915 – October 21, 1917 |
Democratic |
 Paul O. Husting |
10 |
| Re-elected in 1916. |
13 |
65th Congress |
| |
October 21, 1917 – April 18, 1918 |
Vacant |
| Elected to finish Husting's term. |
April 18, 1918 – March 4, 1927 |
Republican |
 Irvine Lenroot |
11 |
| 66th Congress |
| 67th Congress |
14 |
Re-elected in 1920.
Lost renomination. |
Re-elected in 1922.
Died. |
14 |
68th Congress |
| 69th Congress |
| Vacant |
June 18, 1925 – September 30, 1925 |
|
| 9 |
 Robert M. La Follette, Jr. |
Republican |
September 30, 1925 – January 3, 1947 |
Elected to finish his father's term |
| 70th Congress |
15 |
Elected in 1926.
Lost renomination. |
March 4, 1927 – March 4, 1933 |
Republican |
 John J. Blaine |
12 |
| Re-elected in 1928. |
15 |
71st Congress |
| 72nd Congress |
| 73rd Congress |
16 |
Elected in 1932.
Lost re-election. |
March 4, 1933 – January 3, 1939 |
Democratic |
 F. Ryan Duffy |
13 |
| Progressive |
Re-elected in 1934. |
16 |
74th Congress |
| 75th Congress |
| 76th Congress |
17 |
Elected in 1938. |
January 3, 1939 – January 3, 1963 |
Republican |
 Alexander Wiley |
14 |
| Republican |
Re-elected in 1940.
Lost renomination. |
17 |
77th Congress |
| 78th Congress |
| 79th Congress |
18 |
Re-elected in 1944. |
| 10 |
 Joseph McCarthy |
Republican |
January 3, 1947 – May 2, 1957 |
Elected in 1946. |
18 |
80th Congress |
| 81st Congress |
| 82nd Congress |
19 |
Re-elected in 1950. |
Re-elected in 1952.
Died. |
19 |
83rd Congress |
| 84th Congress |
| 85th Congress |
20 |
Re-elected in 1956.
Lost re-election. |
| Vacant |
May 3, 1957 – August 27, 1957 |
|
| 11 |
 William Proxmire |
Democratic |
August 28, 1957 – January 3, 1989 |
Elected to finish McCarthy's term |
| Re-elected in 1958. |
20 |
86th Congress |
| 87th Congress |
| 88th Congress |
21 |
Elected in 1962. |
January 8, 1963 – January 3, 1981 |
Democratic |
 Gaylord A. Nelson |
15 |
| Re-elected in 1964. |
21 |
89th Congress |
| 90th Congress |
| 91st Congress |
22 |
Re-elected in 1968. |
| Re-elected in 1970. |
22 |
92nd Congress |
| 93rd Congress |
| 94th Congress |
23 |
Re-elected in 1974.
Lost re-election. |
| Re-elected in 1976. |
23 |
95th Congress |
| 96th Congress |
| 97th Congress |
24 |
Elected in 1980. |
January 3, 1981 – January 3, 1993 |
Republican |
 Robert W. Kasten, Jr. |
16 |
Re-elected in 1982.
Retired. |
24 |
98th Congress |
| 99th Congress |
| 100th Congress |
25 |
Re-elected in 1986.
Lost re-election. |
| 12 |
 Herb Kohl |
Democratic |
January 3, 1989 – January 3, 2013 |
Elected in 1988. |
25 |
101st Congress |
| 102nd Congress |
| 103rd Congress |
26 |
Elected in 1992. |
January 3, 1993 – January 3, 2011 |
Democratic |
 Russ Feingold |
17 |
| Re-elected in 1994. |
26 |
104th Congress |
| 105th Congress |
| 106th Congress |
27 |
Re-elected in 1998. |
| Re-elected in 2000. |
27 |
107th Congress |
| 108th Congress |
| 109th Congress |
28 |
Re-elected in 2004.
Lost re-election. |
Re-elected in 2006.
Retired. |
28 |
110th Congress |
| 111th Congress |
| 112th Congress |
29 |
Elected in 2010. |
January 3, 2011 – Present |
Republican |
 Ron Johnson |
18 |
| 13 |
 Tammy Baldwin |
Democratic |
January 3, 2013 – Present |
Elected in 2012. |
29 |
113th Congress |
| 114th Congress |
| 115th Congress |
39 |
Re-elected in 2016. |
| To be determined in the 2018 election. |
30 |
116th Congress |
| 117th Congress |
| 118th Congress |
31 |
To be determined in the 2022 election. |
| # |
Senator |
Party |
Years in office |
Electoral history |
T e r m |
|
T e r m |
Electoral history |
Years in office |
Party |
Senator |
# |
| Class 1 |
Class 3 |