List of United States senators from Wisconsin

Wisconsin was admitted to the Union on May 29, 1848. Its current U.S. senators are Republican Ron Johnson (since 2011) and Democrat Tammy Baldwin (since 2013), making it one of seven states to have a split United States Senate delegation. William Proxmire was the state's longest serving senator (served 1957–1989).

Current delegation
Ron Johnson (R)
Tammy Baldwin (D)

List of senators

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

See also

References
  1. "TWO SENATORS ELECTED". The New York Times. January 27, 1897. p. 3.
  2. "Senator Spooner Re-elected". The New York Times. January 28, 1903. p. 8.
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