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).

List of senators

 * - style="height:2em"
 * colspan=3 | Vacant
 * nowrap | May 29, 1848 – Jun 8, 1848
 * Wisconsin elected its senators 10 days after statehood.
 * rowspan=3 | 1
 * rowspan=2 | 1
 * Wisconsin elected its senators 10 days after statehood.
 * nowrap | May 29, 1848 – Jun 8, 1848
 * colspan=3 | Vacant
 * colspan=3 | Vacant

! rowspan=5 | 1 ! rowspan=4 | 1
 * - style="height:2em"
 * rowspan=5 align=left | Henry_Dodge_portrait.jpg Henry Dodge
 * rowspan=5 | Democratic
 * rowspan=5 nowrap | Jun 8, 1848 – Mar 3, 1857
 * rowspan=2 | Elected in 1848.
 * Elected in 1848.
 * rowspan=4 nowrap | Jun 8, 1848 – Mar 3, 1855
 * rowspan=4 | Democratic
 * rowspan=4 align=right | Isaac P. Walker.jpg Isaac P. Walker


 * - style="height:2em"
 * rowspan=3 | 2
 * rowspan=3 | Re-elected in 1849.Retired.
 * rowspan=3 | Re-elected in 1849.Retired.


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1851.Retired.
 * rowspan=3 | 2


 * - style="height:2em"

! rowspan=3 | 2
 * - style="height:2em"
 * rowspan=3 | 3
 * rowspan=3 | Elected in 1854. Retired.
 * rowspan=3 nowrap | Mar 4, 1855 – Mar 3, 1861
 * rowspan=3 | Republican
 * rowspan=3 align=right | Charles Durkee.jpg Charles Durkee
 * rowspan=3 align=right | Charles Durkee.jpg Charles Durkee

! rowspan=6 | 2
 * - style="height:2em"
 * rowspan=6 align=left | James rood doolittle.jpg James R. Doolittle
 * rowspan=6 | Republican
 * rowspan=6 nowrap | Mar 4, 1857 – Mar 3, 1869
 * rowspan=3 | Elected in 1857.
 * rowspan=3 | 3


 * - style="height:2em"

! rowspan=9 | 3
 * - style="height:2em"
 * rowspan=3 | 4
 * rowspan=3 | Elected in 1861.
 * rowspan=9 nowrap | Mar 4, 1861 – Mar 3, 1879
 * rowspan=9 | Republican
 * rowspan=9 align=right | Timothy O. Howe - Brady-Handy.jpg Timothy O. Howe
 * rowspan=9 align=right | Timothy O. Howe - Brady-Handy.jpg Timothy O. Howe


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1863. Retired.
 * rowspan=3 | 4


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | 5
 * rowspan=3 | Re-elected in 1866.
 * rowspan=3 | Re-elected in 1866.

! rowspan=3 | 3
 * - style="height:2em"
 * rowspan=3 align=left | Matthew H. Carpenter - Brady-Handy.jpg Matthew H. Carpenter
 * rowspan=3 | Republican
 * rowspan=3 nowrap | Mar 4, 1869 – Mar 3, 1875
 * rowspan=3 | Elected in 1869.Lost re-election.
 * rowspan=3 | 5


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | 6
 * rowspan=3 | Re-elected in 1872.Lost re-election.
 * rowspan=3 | Re-elected in 1872.Lost re-election.

! rowspan=4 | 4
 * - style="height:2em"
 * rowspan=4 align=left | Angus Cameron - Brady-Handy.jpg Angus Cameron
 * rowspan=4 | Republican
 * rowspan=4 nowrap | Mar 4, 1875 – Mar 3, 1881
 * rowspan=4 | Elected in 1875.Retired.
 * rowspan=4 | 6


 * - style="height:2em"

! 4
 * - style="height:2em"
 * rowspan=5 | 7
 * Elected in 1879.Died.
 * nowrap | Mar 4, 1879 – Feb 24, 1881
 * | Republican
 * align=right | Matthew H. Carpenter - Brady-Handy.jpg Matthew H. Carpenter
 * align=right | Matthew H. Carpenter - Brady-Handy.jpg Matthew H. Carpenter


 * - style="height:2em"
 * rowspan=2 |
 * rowspan=2 nowrap | Feb 24, 1881 – Mar 14, 1881
 * rowspan=2 colspan=3 | Vacant

! rowspan=7 | 5
 * - style="height:2em"
 * rowspan=7 align=left | Philetus Sawyer - Brady-Handy.jpg Philetus Sawyer
 * rowspan=7 | Republican
 * rowspan=7 nowrap | Mar 4, 1881 – Mar 3, 1893
 * rowspan=4 | Elected in 1881.
 * rowspan=4 | 7

! rowspan=2 | 5
 * - style="height:2em"
 * rowspan=2 | Elected to finish Carpenter's term.Retired.
 * rowspan=2 nowrap | Mar 14, 1881 – Mar 3, 1885
 * rowspan=2 | Republican
 * rowspan=2 align=right | Angus Cameron - Brady-Handy.jpg Angus Cameron


 * - style="height:2em"

! rowspan=3 | 6
 * - style="height:2em"
 * rowspan=3 | 8
 * rowspan=3 | Elected in 1885.Lost re-election.
 * rowspan=3 nowrap | Mar 4, 1885 – Mar 3, 1891
 * rowspan=3 | Republican
 * rowspan=3 align=right | John Coit Spooner.jpg John Coit Spooner
 * rowspan=3 align=right | John Coit Spooner.jpg John Coit Spooner


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1887.Retired.
 * rowspan=3 | 8


 * - style="height:2em"

! rowspan=3 | 7
 * - style="height:2em"
 * rowspan=3 | 9
 * rowspan=3 | Elected in 1891.Lost renomination.
 * rowspan=3 nowrap | Mar 4, 1891 – Mar 3, 1897
 * rowspan=3 | Democratic
 * rowspan=3 align=right | Vilas2.jpg William F. Vilas
 * rowspan=3 align=right | Vilas2.jpg William F. Vilas

! rowspan=3 | 6
 * - style="height:2em"
 * rowspan=3 align=left | John L. Mitchell.jpg John L. Mitchell
 * rowspan=3 | Democratic
 * rowspan=3 nowrap | Mar 4, 1893 – Mar 3, 1899
 * rowspan=3 | Elected in 1893.Retired.
 * rowspan=3 | 9


 * - style="height:2em"

! rowspan=6 | 8
 * - style="height:2em"
 * rowspan=3 | 10
 * rowspan=3 | Elected in 1897.
 * rowspan=6 nowrap | Mar 4, 1897 – Apr 30, 1907
 * rowspan=6 | Republican
 * rowspan=6 align=right | John Coit Spooner.jpg John Coit Spooner
 * rowspan=6 align=right | John Coit Spooner.jpg John Coit Spooner

! rowspan=3 | 7
 * - style="height:2em"
 * rowspan=3 align=left | Joseph Quarles.jpg Joseph V. Quarles
 * rowspan=3 | Republican
 * rowspan=3 nowrap | Mar 4, 1899 – Mar 3, 1905
 * rowspan=3 | Elected in 1899.Retired.
 * rowspan=3 | 10


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=5 | 11
 * rowspan=3 | Re-elected in 1903. Resigned.
 * rowspan=3 | Re-elected in 1903. Resigned.

! rowspan=15 | 8
 * - style="height:2em"
 * rowspan=15 align=left | Robert_M._La_Follette,_Sr.jpg Robert M. La Follette
 * rowspan=15 | Republican
 * rowspan=15 nowrap | Jan 4, 1906 – Jun 18, 1925
 * rowspan=5 | Elected in 1905.Did not assume office until Jan 4, 1906 after resigning as Governor of Wisconsin.
 * rowspan=5 | 11


 * - style="height:2em"


 * - style="height:2em"
 * nowrap | Apr 30, 1907 – May 17, 1907
 * colspan=3 | Vacant
 * colspan=3 | Vacant

! rowspan=4 | 9
 * - style="height:2em"
 * Elected to finish Spooner's term.
 * rowspan=4 nowrap | May 17, 1907 – Mar 3, 1915
 * rowspan=4 | Republican
 * rowspan=4 align=right | Isaac Stephenson.jpg Isaac Stephenson


 * - style="height:2em"
 * rowspan=3 | 12
 * rowspan=3 | Re-elected in 1909.Retired.
 * rowspan=3 | Re-elected in 1909.Retired.


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1911.
 * rowspan=3 | 12


 * - style="height:2em"

! rowspan=2 | 10
 * - style="height:2em"
 * rowspan=5 | 13
 * rowspan=2 | Elected in 1914.Died.
 * rowspan=2 nowrap | Mar 4, 1915 – Oct 21, 1917
 * rowspan=2 | Democratic
 * rowspan=2 align=right | SenatorHusting.jpg Paul O. Husting
 * rowspan=2 align=right | SenatorHusting.jpg Paul O. Husting


 * - style="height:2em"
 * rowspan=5 | Re-elected in 1916.
 * rowspan=5 | 13


 * - style="height:2em"
 * nowrap | Oct 21, 1917 – Apr 18, 1918
 * colspan=3 | Vacant
 * colspan=3 | Vacant

! rowspan=7 | 11
 * - style="height:2em"
 * rowspan=2 | Elected in 1918 to finish Husting's term.
 * rowspan=7 nowrap | Apr 18, 1918 – Mar 3, 1927
 * rowspan=7 | Republican
 * rowspan=7 align=right | SenatorLenroot.jpg Irvine Lenroot


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=5 | 14
 * rowspan=5 | Re-elected in 1920.Lost renomination.
 * rowspan=5 | Re-elected in 1920.Lost renomination.


 * - style="height:2em"
 * rowspan=2 | Re-elected in 1922.Died.
 * rowspan=5 | 14


 * - style="height:2em"


 * - style="height:2em"
 * colspan=3 | Vacant
 * nowrap | Jun 18, 1925 – Sep 30, 1925

! rowspan=11 | 9
 * - style="height:2em"
 * rowspan=11 align=left | RMLaFolletteJr.jpg Robert M. La Follette Jr.
 * rowspan=5 | Republican
 * rowspan=11 nowrap | Sep 30, 1925 – Jan 3, 1947
 * rowspan=2 | Elected to finish his father's term

! rowspan=3 | 12
 * - style="height:2em"
 * rowspan=3 | 15
 * rowspan=3 | Elected in 1926.Lost renomination.
 * rowspan=3 nowrap | Mar 4, 1927 – Mar 3, 1933
 * rowspan=3 | Republican
 * rowspan=3 align=right | John J. Blaine.jpg John J. Blaine
 * rowspan=3 align=right | John J. Blaine.jpg John J. Blaine


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1928.
 * rowspan=3 | 15


 * - style="height:2em"

! rowspan=3 | 13
 * - style="height:2em"
 * rowspan=3 | 16
 * rowspan=3 | Elected in 1932.Lost re-election.
 * rowspan=3 nowrap | Mar 4, 1933 – Jan 3, 1939
 * rowspan=3 | Democratic
 * rowspan=3 align=right | FRyanDuffy.jpg F. Ryan Duffy
 * rowspan=3 align=right | FRyanDuffy.jpg F. Ryan Duffy


 * - style="height:2em"
 * rowspan=6 | Progressive
 * rowspan=3 | Re-elected in 1934.
 * rowspan=3 | 16


 * - style="height:2em"

! rowspan=14 | 14
 * - style="height:2em"
 * rowspan=3 | 17
 * rowspan=3 | Elected in 1938.
 * rowspan=14 nowrap | Jan 3, 1939 – Jan 3, 1963
 * rowspan=14 | Republican
 * rowspan=14 align=right | Alexander Wiley.jpg Alexander Wiley
 * rowspan=14 align=right | Alexander Wiley.jpg Alexander Wiley


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1940.Lost nomination as a Republican.
 * rowspan=3 | 17


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | 18
 * rowspan=3 | Re-elected in 1944.
 * rowspan=3 | Re-elected in 1944.

! rowspan=6 | 10
 * - style="height:2em"
 * rowspan=6 align=left | Joseph McCarthy.jpg Joseph McCarthy
 * rowspan=6 | Republican
 * rowspan=6 nowrap | Jan 3, 1947 – May 2, 1957
 * rowspan=3 | Elected in 1946.
 * rowspan=3 | 18


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | 19
 * rowspan=3 | Re-elected in 1950.
 * rowspan=3 | Re-elected in 1950.


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1952.Died.
 * rowspan=5 | 19


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=5 | 20
 * rowspan=5 | Re-elected in 1956.Lost re-election.
 * rowspan=5 | Re-elected in 1956.Lost re-election.


 * - style="height:2em"
 * colspan=3 | Vacant
 * nowrap | May 2, 1957 – Aug 27, 1957

! rowspan=16 | 11
 * - style="height:2em"
 * rowspan=16 align=left | Senator William Proxmire.jpg William Proxmire
 * rowspan=16 | Democratic
 * rowspan=16 nowrap | Aug 28, 1957 – Jan 3, 1989
 * Elected to finish McCarthy's term


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1958.
 * rowspan=3 | 20


 * - style="height:2em"

! rowspan=9 | 15
 * - style="height:2em"
 * rowspan=3 | 21
 * rowspan=3 | Elected in 1962.
 * rowspan=9 nowrap | Jan 3, 1963 – Jan 3, 1981
 * rowspan=9 | Democratic
 * rowspan=9 align=right | GaylordNelson.jpg Gaylord Nelson
 * rowspan=9 align=right | GaylordNelson.jpg Gaylord Nelson


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1964.
 * rowspan=3 | 21


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | 22
 * rowspan=3 | Re-elected in 1968.
 * rowspan=3 | Re-elected in 1968.


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1970.
 * rowspan=3 | 22


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | 23
 * rowspan=3 | Re-elected in 1974.Lost re-election.
 * rowspan=3 | Re-elected in 1974.Lost re-election.


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1976.
 * rowspan=3 | 23


 * - style="height:2em"

! rowspan=6 | 16
 * - style="height:2em"
 * rowspan=3 | 24
 * rowspan=3 | Elected in 1980.
 * rowspan=6 nowrap | Jan 3, 1981 – Jan 3, 1993
 * rowspan=6 | Republican
 * rowspan=6 align=right | SenatorKasten.jpg Bob Kasten
 * rowspan=6 align=right | SenatorKasten.jpg Bob Kasten


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1982.Retired.
 * rowspan=3 | 24


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | 25
 * rowspan=3 | Re-elected in 1986.Lost re-election.
 * rowspan=3 | Re-elected in 1986.Lost re-election.

! rowspan=12 | 12
 * - style="height:2em"
 * rowspan=12 align=left | Herbert Kohl, official photo.jpg Herb Kohl
 * rowspan=12 | Democratic
 * rowspan=12 nowrap | Jan 3, 1989 – Jan 3, 2013
 * rowspan=3 | Elected in 1988.
 * rowspan=3 | 25


 * - style="height:2em"

! rowspan=9 | 17
 * - style="height:2em"
 * rowspan=3 | 26
 * rowspan=3 | Elected in 1992.
 * rowspan=9 nowrap | Jan 3, 1993 – Jan 3, 2011
 * rowspan=9 | Democratic
 * rowspan=9 align=right | Russ Feingold Official Portrait 3.jpg Russ Feingold
 * rowspan=9 align=right | Russ Feingold Official Portrait 3.jpg Russ Feingold


 * - style="height:2em"
 * rowspan=3 | Re-elected in 1994.
 * rowspan=3 | 26


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | 27
 * rowspan=3 | Re-elected in 1998.
 * rowspan=3 | Re-elected in 1998.


 * - style="height:2em"
 * rowspan=3 | Re-elected in 2000.
 * rowspan=3 | 27


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | 28
 * rowspan=3 | Re-elected in 2004.Lost re-election.
 * rowspan=3 | Re-elected in 2004.Lost re-election.


 * - style="height:2em"
 * rowspan=3 | Re-elected in 2006.Retired.
 * rowspan=3 | 28


 * - style="height:2em"

! rowspan=9 | 18
 * - style="height:2em"
 * rowspan=3 | 29
 * rowspan=3 | Elected in 2010.
 * rowspan=9 nowrap | Jan 3, 2011 – present
 * rowspan=9 | Republican
 * rowspan=9 align=right | Ron Johnson, official portrait, 112th Congress.jpg Ron Johnson
 * rowspan=9 align=right | Ron Johnson, official portrait, 112th Congress.jpg Ron Johnson

! rowspan=6 | 13
 * - style="height:2em"
 * rowspan=6 align=left | Tammy Baldwin, official portrait, 113th Congress.jpg Tammy Baldwin
 * rowspan=6 | Democratic
 * rowspan=6 nowrap | Jan 3, 2013 – present
 * rowspan=3 | Elected in 2012.
 * rowspan=3 | 29


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | 30
 * rowspan=3 | Re-elected in 2016.
 * rowspan=3 | Re-elected in 2016.


 * - style="height:2em"
 * rowspan=3 | Re-elected in 2018.
 * rowspan=3 | 30


 * - style="height:2em"


 * - style="height:2em"
 * rowspan=3 | 31
 * rowspan=3 | Re-elected in 2022.
 * rowspan=3 | Re-elected in 2022.


 * - style="height:2em"
 * rowspan=3 colspan=5 | To be determined in the 2024 election.
 * rowspan=3| 31


 * - style="height:2em"


 * - style="height:2em"
 * 32
 * colspan=5 | To be determined in the 2028 election.
 * colspan=5 | To be determined in the 2028 election.