Wisconsin was admitted to the Union on May 29, 1848.
Class I
| Senator |
Party |
Took office |
Left office |
Reason |
Notes |
| Henry Dodge |
 |
Democratic |
June 8, 1848 |
March 4, 1857 |
Retired |
Governor of the Wisconsin Territory (1836–1841; 1845–1848) |
| James R. Doolittle |
 |
Republican |
March 4, 1857 |
March 4, 1869 |
|
|
| Matthew H. Carpenter |
 |
Republican |
March 4, 1869 |
March 4, 1875 |
Lost re-election |
Also served in Wisconsin's class III seat |
| Angus Cameron |
 |
Republican |
March 4, 1875 |
March 4, 1881 |
Retired |
Speaker of the Wisconsin State Assembly (1867)
Also served in Wisconsin's class III seat |
| Philetus Sawyer |
 |
Republican |
March 4, 1881 |
March 4, 1893 |
Retired |
|
| John L. Mitchell |
 |
Democratic |
March 4, 1893 |
March 4, 1899 |
Retired |
|
| Joseph V. Quarles |
 |
Republican |
March 4, 1899 |
March 4, 1905 |
Retired |
|
| Robert M. La Follette, Sr. |
 |
Republican |
January 2, 1906 |
June 18, 1925 |
Died |
Governor of Wisconsin (1901–1906) |
| Robert M. La Follette, Jr. |
 |
Republican |
September 30, 1925 |
January 3, 1947 |
Lost renomination |
|
| Progressive |
| Republican |
| Joseph R. McCarthy |
 |
Republican |
January 3, 1947 |
May 2, 1957 |
Died |
|
| William Proxmire |
 |
Democratic |
August 28, 1957 |
January 3, 1989 |
Retired |
|
| Herb Kohl |
 |
Democratic |
January 3, 1989 |
Present |
Incumbent |
|
Class III
| Senator |
Party |
Took office |
Left office |
Reason |
Notes |
| Isaac P. Walker |
 |
Democratic |
June 8, 1848 |
March 4, 1855 |
Retired |
|
| Charles Durkee |
 |
Republican |
March 4, 1855 |
March 4, 1861 |
|
Governor of the Utah Territory (1865–1869) |
| Timothy O. Howe |
 |
Republican |
March 4, 1861 |
March 4, 1879 |
Lost re-election |
U.S. Postmaster General (1881–1883) |
| Matthew H. Carpenter |
 |
Republican |
March 4, 1879 |
February 24, 1881 |
Died |
Also served in Wisconsin's class I seat |
| Angus Cameron |
 |
Republican |
March 14, 1881 |
March 4, 1885 |
Retired |
Also served in Wisconsin's class I seat |
| John Coit Spooner |
 |
Republican |
March 4, 1885 |
March 4, 1891 |
Lost re-election |
|
| William F. Vilas |
 |
Democratic |
March 4, 1891 |
March 4, 1897 |
Lost renomination |
Secretary of the Interior (1888–1889)
U.S. Postmaster General (1885–1888) |
| John Coit Spooner |
 |
Republican |
March 4, 1897 |
April 30, 1907 |
Resigned |
|
| Isaac Stephenson |
 |
Republican |
May 17, 1907 |
March 4, 1915 |
Retired |
|
| Paul O. Husting |
 |
Democratic |
March 4, 1915 |
October 21, 1917 |
Died |
|
| Irvine Lenroot |
 |
Republican |
April 18, 1918 |
March 4, 1927 |
Lost renomination |
Speaker of the Wisconsin State Assembly (1903–1907) |
| John J. Blaine |
 |
Republican |
March 4, 1927 |
March 4, 1933 |
Lost renomination |
Governor of Wisconsin (1921–1927) |
| F. Ryan Duffy |
 |
Democratic |
March 4, 1933 |
January 3, 1939 |
Lost re-election |
Circuit Judge, 7th Circuit Court of Appeals |
| Alexander Wiley |
 |
Republican |
January 3, 1939 |
January 3, 1963 |
Lost re-election |
|
| Gaylord A. Nelson |
 |
Democratic |
January 8, 1963 |
January 3, 1981 |
Lost re-election |
Governor of Wisconsin (1959–1962); Founder of Earth Day |
| Robert W. Kasten, Jr. |
 |
Republican |
January 3, 1981 |
January 3, 1993 |
Lost re-election |
|
| Russ Feingold |
 |
Democratic |
January 3, 1993 |
January 3, 2011 |
Lost re-election |
|
| Ron Johnson |
 |
Republican |
January 3, 2011 |
Present |
Incumbent |
|
See also
| Lists of United States congressional delegations |
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| States |
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| Other |
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| Obsolete |
Dakota Territory · Northwest Territory · Orleans Territory · Philippines · Southwest Territory
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| Lists of former House members, lists of former Senators |
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| United States Senators from Wisconsin |
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| Class 1 |
Dodge · Doolittle · Carpenter · Cameron · Sawyer · Mitchell · Quarles · La Follette, Sr. · La Follette, Jr. · McCarthy · Proxmire · Kohl
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| Class 3 |
Walker · Durkee · Howe · Carpenter · Cameron · Spooner · Vilas · Spooner · Stephenson · Husting · Lenroot · Blaine · Duffy · Wiley · Nelson · Kasten · Feingold · Johnson
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State of Wisconsin |
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| Madison (capital) |
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| Topics |
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| Regions |
Apostle Islands · Central Plain · Chippewa Valley · Door Peninsula · Driftless Area · Eastern Ridges and Lowlands · Fox River Valley · Great River Road · Lake Superior Lowland · Northern Highland · Western Upland
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Major metropolitan areas
(pop. over 500,000) |
Chicago metropolitan area · Madison metropolitan area · Milwaukee metropolitan area · Twin Cities metropolitan area
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Largest cities
(pop. over 50,000) |
Appleton · Eau Claire · Green Bay · Janesville · Kenosha · La Crosse · Madison · Milwaukee · Oshkosh · Racine · Waukesha · West Allis
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Smaller cities
(pop. 15,000 to 50,000) |
Beaver Dam · Beloit · Brookfield · Cudahy · De Pere · Fitchburg · Fond du Lac · Franklin · Greenfield · Manitowoc · Marshfield · Menasha · Mequon · Middleton · Muskego · Neenah · New Berlin · Oak Creek · Onalaska · Sheboygan · South Milwaukee · Stevens Point · Sun Prairie · Superior · Watertown · Wausau · Wauwatosa · West Bend · Wisconsin Rapids
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Largest villages
(pop. over 15,000) |
Allouez · Ashwaubenon · Caledonia · Germantown · Menomonee Falls · Mount Pleasant · Pleasant Prairie
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| Counties |
Adams · Ashland · Barron · Bayfield · Brown · Buffalo · Burnett · Calumet · Chippewa · Clark · Columbia · Crawford · Dane · Dodge · Door · Douglas · Dunn · Eau Claire · Florence · Fond du Lac · Forest · Grant · Green · Green Lake · Iowa · Iron · Jackson · Jefferson · Juneau · Kenosha · Kewaunee · La Crosse · Lafayette · Langlade · Lincoln · Manitowoc · Marathon · Marinette · Marquette · Menominee · Milwaukee · Monroe · Oconto · Oneida · Outagamie · Ozaukee · Pepin · Pierce · Polk · Portage · Price · Racine · Richland · Rock · Rusk · Sauk · Sawyer · Shawano · Sheboygan · St. Croix · Taylor · Trempealeau · Vernon · Vilas · Walworth · Washburn · Washington · Waukesha · Waupaca · Waushara · Winnebago · Wood
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Categories: United States Senators from Wisconsin | Lists of Wisconsin politicians | Lists of United States Senators by state