Class 1
Class 1 U.S. senators belong to the electoral cycle that has recently been contested in 2000, 2006, 2012, and 2018. The next election will be in 2024. |
C |
Class 3
Class 3 U.S. senators belong to the electoral cycle that has recently been contested in 2004, 2010, 2016, and 2022. The next election will be in 2028. |
# |
Senator |
Party |
Dates in office |
Electoral history |
T |
T |
Electoral history |
Dates in office |
Party |
Senator |
# |
Vacant |
May 29, 1848 – Jun 8, 1848 |
Wisconsin elected its senators 10 days after statehood. |
1 |
30th |
1 |
Wisconsin elected its senators 10 days after statehood. |
May 29, 1848 – Jun 8, 1848 |
Vacant |
1 |
Henry Dodge |
Democratic |
Jun 8, 1848 – Mar 3, 1857 |
Elected in 1848. |
Elected in 1848. |
Jun 8, 1848 – Mar 3, 1855 |
Democratic |
Isaac P. Walker |
1 |
31st |
2 |
Re-elected in 1849.Retired. |
Re-elected in 1851.Retired. |
2 |
32nd |
33rd |
34th |
3 |
Elected in 1854. Retired. |
Mar 4, 1855 – Mar 3, 1861 |
Republican |
Charles Durkee |
2 |
2 |
James R. Doolittle |
Republican |
Mar 4, 1857 – Mar 3, 1869 |
Elected in 1857. |
3 |
35th |
36th |
37th |
4 |
Elected in 1861. |
Mar 4, 1861 – Mar 3, 1879 |
Republican |
Timothy O. Howe |
3 |
Re-elected in 1863. Retired. |
4 |
38th |
39th |
40th |
5 |
Re-elected in 1866. |
3 |
Matthew H. Carpenter |
Republican |
Mar 4, 1869 – Mar 3, 1875 |
Elected in 1869.Lost re-election. |
5 |
41st |
42nd |
43rd |
6 |
Re-elected in 1872.Lost re-election. |
4 |
Angus Cameron |
Republican |
Mar 4, 1875 – Mar 3, 1881 |
Elected in 1875.Retired. |
6 |
44th |
45th |
46th |
7 |
Elected in 1879.Died. |
Mar 4, 1879 – Feb 24, 1881 |
Republican |
Matthew H. Carpenter |
4 |
|
Feb 24, 1881 – Mar 14, 1881 |
Vacant |
5 |
Philetus Sawyer |
Republican |
Mar 4, 1881 – Mar 3, 1893 |
Elected in 1881. |
7 |
47th |
Elected to finish Carpenter's term.Retired. |
Mar 14, 1881 – Mar 3, 1885 |
Republican |
Angus Cameron |
5 |
48th |
49th |
8 |
Elected in 1885.Lost re-election. |
Mar 4, 1885 – Mar 3, 1891 |
Republican |
John Coit Spooner |
6 |
Re-elected in 1887.Retired. |
8 |
50th |
51st |
52nd |
9 |
Elected in 1891.Lost renomination. |
Mar 4, 1891 – Mar 3, 1897 |
Democratic |
William F. Vilas |
7 |
6 |
John L. Mitchell |
Democratic |
Mar 4, 1893 – Mar 3, 1899 |
Elected in 1893.Retired. |
9 |
53rd |
54th |
55th |
10 |
Elected in 1897.[1] |
Mar 4, 1897 – Apr 30, 1907 |
Republican |
John Coit Spooner |
8 |
7 |
Joseph V. Quarles |
Republican |
Mar 4, 1899 – Mar 3, 1905 |
Elected in 1899.Retired. |
10 |
56th |
57th |
58th |
11 |
Re-elected in 1903.[2]Resigned. |
8 |
Robert M. La Follette |
Republican |
Jan 4, 1906 – Jun 18, 1925 |
Elected in 1905.Did not assume office until Jan 4, 1906 after resigning as Governor of Wisconsin. |
11 |
59th |
60th |
|
Apr 30, 1907 – May 17, 1907 |
Vacant |
Elected to finish Spooner's term. |
May 17, 1907 – Mar 3, 1915 |
Republican |
Isaac Stephenson |
9 |
61st |
12 |
Re-elected in 1909.Retired. |
Re-elected in 1911. |
12 |
62nd |
63rd |
64th |
13 |
Elected in 1914.Died. |
Mar 4, 1915 – Oct 21, 1917 |
Democratic |
Paul O. Husting |
10 |
Re-elected in 1916. |
13 |
65th |
|
Oct 21, 1917 – Apr 18, 1918 |
Vacant |
Elected in 1918 to finish Husting's term. |
Apr 18, 1918 – Mar 3, 1927 |
Republican |
Irvine Lenroot |
11 |
66th |
67th |
14 |
Re-elected in 1920.Lost renomination. |
Re-elected in 1922.Died. |
14 |
68th |
69th |
Vacant |
Jun 18, 1925 – Sep 30, 1925 |
|
9 |
Robert M. La Follette Jr. |
Republican |
Sep 30, 1925 – Jan 3, 1947 |
Elected to finish his father's term |
70th |
15 |
Elected in 1926.Lost renomination. |
Mar 4, 1927 – Mar 3, 1933 |
Republican |
John J. Blaine |
12 |
Re-elected in 1928. |
15 |
71st |
72nd |
73rd |
16 |
Elected in 1932.Lost re-election. |
Mar 4, 1933 – Jan 3, 1939 |
Democratic |
F. Ryan Duffy |
13 |
Progressive |
Re-elected in 1934. |
16 |
74th |
75th |
76th |
17 |
Elected in 1938. |
Jan 3, 1939 – Jan 3, 1963 |
Republican |
Alexander Wiley |
14 |
Re-elected in 1940.Lost nomination as a Republican. |
17 |
77th |
78th |
79th |
18 |
Re-elected in 1944. |
10 |
Joseph McCarthy |
Republican |
Jan 3, 1947 – May 2, 1957 |
Elected in 1946. |
18 |
80th |
81st |
82nd |
19 |
Re-elected in 1950. |
Re-elected in 1952.Died. |
19 |
83rd |
84th |
85th |
20 |
Re-elected in 1956.Lost re-election. |
Vacant |
May 3, 1957 – Aug 27, 1957 |
|
11 |
William Proxmire |
Democratic |
Aug 28, 1957 – Jan 3, 1989 |
Elected to finish McCarthy's term |
Re-elected in 1958. |
20 |
86th |
87th |
88th |
21 |
Elected in 1962. |
Jan 3, 1963 – Jan 3, 1981 |
Democratic |
Gaylord Nelson |
15 |
Re-elected in 1964. |
21 |
89th |
90th |
91st |
22 |
Re-elected in 1968. |
Re-elected in 1970. |
22 |
92nd |
93rd |
94th |
23 |
Re-elected in 1974.Lost re-election. |
Re-elected in 1976. |
23 |
95th |
96th |
97th |
24 |
Elected in 1980. |
Jan 3, 1981 – Jan 3, 1993 |
Republican |
Bob Kasten |
16 |
Re-elected in 1982.Retired. |
24 |
98th |
99th |
100th |
25 |
Re-elected in 1986.Lost re-election. |
12 |
Herb Kohl |
Democratic |
Jan 3, 1989 – Jan 3, 2013 |
Elected in 1988. |
25 |
101st |
102nd |
103rd |
26 |
Elected in 1992. |
Jan 3, 1993 – Jan 3, 2011 |
Democratic |
Russ Feingold |
17 |
Re-elected in 1994. |
26 |
104th |
105th |
106th |
27 |
Re-elected in 1998. |
Re-elected in 2000. |
27 |
107th |
108th |
109th |
28 |
Re-elected in 2004.Lost re-election. |
Re-elected in 2006.Retired. |
28 |
110th |
111th |
112th |
29 |
Elected in 2010. |
Jan 3, 2011 – present |
Republican |
Ron Johnson |
18 |
13 |
Tammy Baldwin |
Democratic |
Jan 3, 2013 – present |
Elected in 2012. |
29 |
113th |
114th |
115th |
30 |
Re-elected in 2016. |
Re-elected in 2018. |
30 |
116th |
117th |
118th |
31 |
Re-elected in 2022. |
To be determined in the 2024 election. |
31 |
119th |
120th |
121st |
32 |
To be determined in the 2028 election. |
# |
Senator |
Party |
Years in office |
Electoral history |
T |
C |
T |
Electoral history |
Years in office |
Party |
Senator |
# |
Class 1 |
Class 3 |