Congress
|
Dates
|
Democratic whip
|
Democratic leader
|
Majority
|
Republican leader
|
Republican whip
|
63rd
|
May 28, 1913
?
March 4, 1915
|
J. Hamilton Lewis
|
None
|
Democratic
← majority
|
None
|
None
|
64th
|
March 4, 1915
?
December 6, 1915
|
December 6, 1915
?
December 13, 1915
|
James Wadsworth
|
December 13, 1915
?
March 4, 1917
|
Charles Curtis
|
65th
|
March 4, 1917
?
March 4, 1919
|
66th
|
March 4, 1919
?
April 27, 1920
|
Peter Gerry
|
Republican
majority →
|
Henry Cabot Lodge
Unofficial
|
April 27, 1920
?
March 4, 1921
|
Oscar Underwood
|
67th
|
March 4, 1921
?
March 4, 1923
|
68th
|
March 4, 1923
?
December 3, 1923
|
December 3, 1923
?
November 9, 1924
|
Joseph T. Robinson
|
November 9, 1924 ?
March 4, 1925
|
Charles Curtis
Acting
|
Wesley Jones
Acting
|
69th
|
March 4, 1925
?
March 4, 1927
|
Charles Curtis
|
Wesley Jones
|
70th
|
March 4, 1927
?
March 4, 1929
|
71st
|
March 4, 1929
?
March 4, 1931
|
Morris Sheppard
|
James E. Watson
|
Simeon Fess
|
72nd
|
March 4, 1931
?
March 4, 1933
|
73rd
|
March 4, 1933
?
January 3, 1935
|
J. Hamilton Lewis
|
Democratic
← majority
|
Charles L. McNary
|
Felix Hebert
|
74th
|
January 3, 1935
?
January 3, 1937
|
None
[a]
|
75th
|
January 3, 1937
?
July 14, 1937
|
July 14, 1937 ?
January 3, 1939
|
Alben W. Barkley
|
76th
|
January 3, 1939 ?
April 9, 1939
|
April 9, 1939 ?
January 3, 1940
|
Sherman Minton
|
January 3, 1940 ?
January 3, 1941
|
Warren Austin
Acting
|
77th
|
January 3, 1941
?
January 3, 1943
|
J. Lister Hill
|
Charles L. McNary
|
78th
|
January 3, 1943
?
February 25, 1944
|
Kenneth Wherry
|
February 25, 1944 ?
January 3, 1945
|
Wallace H. White
Acting
|
79th
|
January 3, 1945
?
January 3, 1947
|
Wallace H. White
|
80th
|
January 3, 1947
?
January 3, 1949
|
Scott W. Lucas
|
Republican
majority →
|
81st
|
January 3, 1949
?
January 3, 1951
|
Francis Myers
|
Scott W. Lucas
|
Democratic
← majority
|
Kenneth S. Wherry
|
Leverett Saltonstall
|
82nd
|
January 3, 1951
?
January 3, 1952
|
Lyndon B. Johnson
|
Ernest McFarland
|
January 3, 1952
?
January 3, 1953
|
Styles Bridges
|
83rd
|
January 3, 1953
?
July 31, 1953
|
Earle Clements
|
Lyndon B. Johnson
|
Republican
majority →
|
Robert A. Taft
|
August 3, 1953
?
January 3, 1955
|
William Knowland
|
84th
|
January 3, 1955
?
January 3, 1957
|
Democratic
← majority
|
85th
|
January 3, 1957
?
January 3, 1959
|
Mike Mansfield
|
Everett Dirksen
|
86th
|
January 3, 1959
?
January 3, 1961
|
Everett Dirksen
|
Thomas Kuchel
|
87th
|
January 3, 1961
?
January 3, 1963
|
Hubert Humphrey
|
Mike Mansfield
|
88th
|
January 3, 1963
?
January 3, 1965
|
89th
|
January 3, 1965
?
January 3, 1967
|
Russell B. Long
|
90th
|
January 3, 1967
?
January 3, 1969
|
91st
|
January 3, 1969
?
September 7, 1969
|
Ted Kennedy
|
Hugh Scott
|
September 24, 1969
?
January 3, 1971
|
Hugh Scott
|
Robert Griffin
|
92nd
|
January 3, 1971
?
January 3, 1973
|
Robert Byrd
|
93rd
|
January 3, 1973
?
January 3, 1975
|
94th
|
January 3, 1975
?
January 3, 1977
|
95th
|
January 3, 1977
?
January 3, 1979
|
Alan Cranston
|
Robert Byrd
|
Howard Baker
|
Ted Stevens
|
96th
|
January 3, 1979
?
November 1, 1979
|
November 1, 1979
?
March 5, 1980
|
Ted Stevens
Acting
|
March 5, 1980
?
January 3, 1981
|
Howard Baker
|
97th
|
January 3, 1981
?
January 3, 1983
|
Republican
majority →
|
98th
|
January 3, 1983
?
January 3, 1985
|
99th
|
January 3, 1985
?
January 3, 1987
|
Bob Dole
|
Alan Simpson
|
100th
|
January 3, 1987
?
January 3, 1989
|
Democratic
← majority
|
101st
|
January 3, 1989
?
January 3, 1991
|
George Mitchell
|
102nd
|
January 3, 1991
?
January 3, 1993
|
Wendell Ford
|
103rd
|
January 3, 1993
?
January 3, 1995
|
104th
|
January 3, 1995
?
June 12, 1996
|
Tom Daschle
|
Republican
majority →
|
Trent Lott
|
June 12, 1996
?
January 3, 1997
|
Trent Lott
|
Don Nickles
|
105th
|
January 3, 1997
?
January 3, 1999
|
106th
|
January 3, 1999
?
January 3, 2001
|
Harry Reid
|
107th
|
January 3, 2001
?
January 20, 2001
|
Democratic
← majority
|
January 20, 2001
?
June 6, 2001
|
Republican
majority →
|
June 6, 2001
?
November 23, 2002
|
Democratic
← majority
|
November 23, 2002
?
January 3, 2003
|
majority →
|
108th
|
January 3, 2003
?
January 3, 2005
|
Bill Frist
|
Mitch McConnell
|
109th
|
January 3, 2005
?
January 3, 2007
|
Dick Durbin
|
Harry Reid
|
110th
|
January 3, 2007
?
December 18, 2007
|
Democratic
← majority
|
Mitch McConnell
|
Trent Lott
|
December 19, 2007
?
January 3, 2009
|
Jon Kyl
|
111th
|
January 3, 2009
?
January 3, 2011
|
112th
|
January 3, 2011
?
January 3, 2013
|
113th
|
January 3, 2013
?
January 3, 2015
|
John Cornyn
|
114th
|
January 3, 2015
?
January 3, 2017
|
Republican
majority →
|
115th
|
January 3, 2017
?
January 3, 2019
|
Chuck Schumer
|
116th
|
January 3, 2019
?
January 3, 2021
|
John Thune
|
117th
|
January 3, 2021
?
January 20, 2021
|
January 20, 2021
?
January 3, 2023
|
Democratic
← majority
|
118th
|
January 3, 2023
?
January 3, 2025
|
Congress
|
Dates
|
Democratic whip
|
Democratic leader
|
Majority
|
Republican leader
|
Republican whip
|