Rank
|
Senator (party-state)
|
Seniority date
|
Other factors
|
1
|
Carl Hayden (D-AZ)
|
March 4, 1927
|
Former representative (15 years)
|
2
|
Richard Russell, Jr. (D-GA)
|
January 12, 1933
|
Former governor
|
3
|
Harry F. Byrd, Sr. (D-VA)
|
March 4, 1933
|
Former governor
|
4
|
James Murray (D-MT)
|
November 7, 1934
|
5
|
Dennis Chavez (D-NM)
|
May 11, 1935
|
Former representative (4 years)
|
6
|
Theodore F. Green (D-RI)
|
January 3, 1937
|
Former governor, Rhode Island 37th in population (1930)
|
7
|
Styles Bridges (R-NH)
|
Former governor, New Hampshire 41st in population (1930)
|
8
|
Allen J. Ellender (D-LA)
|
9
|
Joseph L. Hill (D-AL)
|
January 11, 1938
|
Former representative (15 years)
|
10
|
Alexander Wiley (R-WI)
|
January 3, 1939
|
11
|
William Langer (R-ND)
|
January 3, 1941
|
12
|
George Aiken (R-VT)
|
January 10, 1941
|
Former governor
|
13
|
James Eastland (D-MS)
|
January 3, 1943
|
Previously a senator
|
14
|
John Little McClellan (D-AR)
|
Former representative (4 years)
|
15
|
Howard A. Smith (R-NJ)
|
December 7, 1944
|
16
|
Warren G. Magnuson (D-WA)
|
December 14, 1944
|
Former representative (7 years)
|
17
|
J. William Fulbright (D-AR)
|
January 3, 1945
|
Former representative
|
18
|
Bourke B. Hickenlooper (R-IA)
|
Former governor, Iowa 20th in population (1940)
|
19
|
Olin D. Johnston (D-SC)
|
Former governor, South Carolina 26th in population (1940)
|
20
|
Homer E. Capehart (R-IN)
|
Indiana 12th in population (1940)
|
21
|
Wayne Morse (D-OR)
|
Oregon 34th in population (1940)
|
22
|
Leverett Saltonstall (R-MA)
|
January 4, 1945
|
Former governor
|
23
|
Milton Young (R-ND)
|
March 12, 1945
|
24
|
William F. Knowland (R-CA)
|
August 26, 1945
|
25
|
Spessard Holland (D-FL)
|
September 24, 1946
|
Former governor
|
26
|
Ralph Flanders (R-VT)
|
November 1, 1946
|
27
|
A. Willis Robertson (D-VA)
|
November 6, 1946
|
Former representative (13 years, 10 months)
|
28
|
John Sparkman (D-AL)
|
Former representative (9 years, 10 months)
|
29
|
William E. Jenner (R-IN)
|
January 3, 1947
|
Previously a senator
|
30
|
Edward Martin (R-PA)
|
Former governor, Pennsylvania 2nd in population (1940)
|
31
|
John W. Bricker (R-OH)
|
Former governor, Ohio 4th in population (1940)
|
32
|
Edward John Thye (R-MN)
|
Former governor, Minnesota 18th in population (1940)
|
33
|
Irving Ives (R-NY)
|
New York 1st in population (1940)
|
34
|
Joseph McCarthy[8] (R-WI)
|
Wisconsin 13th in population (1940)
|
35
|
Arthur Vivian Watkins (R-UT)
|
Utah 40th in population (1940)
|
36
|
John J. Williams (R-DE)
|
Delaware 47th in population (1940)
|
37
|
George W. Malone (R-NV)
|
Nevada 48th in population (1940)
|
38
|
John C. Stennis (D-MS)
|
November 17, 1947
|
39
|
Karl Mundt (R-SD)
|
December 31, 1948
|
Former representative
|
40
|
Russell B. Long (D-LA)
|
41
|
Matthew M. Neely[9] (D-WV)
|
January 3, 1949
|
Former representative (twice), Former governor, Previously a senator (twice)
|
42
|
Lyndon Johnson (D-TX)
|
Former representative (12 years)
|
43
|
Estes Kefauver (D-TN)
|
Former representative (10 years)
|
44
|
Margaret Chase Smith (R-ME)
|
Former representative (8 years, 7 months)
|
45
|
Clinton Anderson (D-NM)
|
Former cabinet secretary, Former representative (4 years, 5 months)
|
46
|
Robert S. Kerr (D-OK)
|
Former governor, Oklahoma 22nd in population (1940)
|
47
|
Andrew F. Schoeppel (R-KS)
|
Former governor, Kansas 29th in population (1940)
|
48
|
Paul Douglas (D-IL)
|
Illinois 3rd in population (1940)
|
49
|
Hubert Humphrey (D-MN)
|
Minnesota 18th in population (1940)
|
50
|
Joseph Frear, Jr. (D-DE)
|
Delaware 47th in population (1940)
|
51
|
Henry Dworshak (R-ID)
|
October 14, 1949
|
Previously a senator
|
52
|
Frank Carlson (R-KS)
|
November 27, 1950
|
Former representative (12 years), Former governor
|
53
|
John O. Pastore (D-RI)
|
December 19, 1950
|
54
|
Everett Dirksen (R-IL)
|
January 3, 1951
|
Former representative (16 years)
|
55
|
Francis H. Case (R-SD)
|
Former representative (14 years)
|
56
|
Almer Monroney (D-OK)
|
Former representative (12 years)
|
57
|
Thomas C. Hennings, Jr. (D-MO)
|
Former representative (6 years)
|
58
|
George Smathers (D-FL)
|
Former representative (4 years)
|
59
|
John M. Butler (R-MD)
|
Maryland 28th in population (1940)
|
60
|
Wallace F. Bennett (R-UT)
|
Utah 40th in population (1940)
|
61
|
Charles E. Potter (R-MI)
|
November 5, 1952
|
Former representative
|
62
|
Prescott Bush (R-CT)
|
63
|
Thomas Kuchel (R-CA)
|
January 2, 1953
|
64
|
William A. Purtell (R-CT)
|
January 3, 1953
|
Previously a senator
|
65
|
Albert Gore, Sr. (D-TN)
|
Former representative (14 years)
|
66
|
Henry M. Jackson (D-WA)
|
Former representative (12 years)
|
67
|
James Glenn Beall (R-MD)
|
Former representative (10 years), Maryland 24th in population (1950)
|
68
|
Mike Mansfield (D-MT)
|
Former representative (10 years), Montana 42nd in population (1950)
|
69
|
John F. Kennedy (D-MA)
|
Former representative (6 years)
|
70
|
Frederick G. Payne (R-ME)
|
Former governor, Maine 35th in population (1950)
|
71
|
Frank A. Barrett (R-WY)
|
Former governor, Wyoming 48th in population (1950)
|
72
|
Price Daniel[10] (D-TX)
|
Texas 6th in population (1950)
|
73
|
Stuart Symington (D-MO)
|
Missouri 12th in population (1950)
|
74
|
Barry Goldwater (R-AZ)
|
Arizona 37th in population (1950)
|
75
|
Sam Ervin (D-NC)
|
June 5, 1954
|
Former representative
|
76
|
Norris Cotton (R-NH)
|
November 8, 1954
|
Former representative (7 years, 10 months)
|
77
|
Roman Hruska (R-NE)
|
Former representative (1 year, 10 months)
|
78
|
Joseph C. O'Mahoney (D-WY)
|
November 29, 1954
|
Previously a senator
|
79
|
W. Kerr Scott[11] (D-NC)
|
Former representative (twice), Former governor
|
80
|
Alan Bible (D-NV)
|
December 2, 1954
|
81
|
Carl Curtis (R-NE)
|
January 1, 1955
|
Former representative (15 years)
|
82
|
Clifford P. Case (R-NJ)
|
January 3, 1955
|
Former representative (8 years)
|
83
|
Thomas Martin (R-IA)
|
Former representative (6 years)
|
84
|
Patrick V. McNamara (D-MI)
|
Maryland 24th in population (1950)
|
85
|
Richard L. Neuberger (D-OR)
|
Oregon 31st in population (1950)
|
86
|
Gordon L. Allott (R-CO)
|
Colorado 32nd in population (1950)
|
87
|
W. Chapman Revercomb (R-WV)
|
November 7, 1956
|
Previously a senator (6 years)
|
88
|
John Sherman Cooper (R-KY)
|
Previously a senator (twice) (total tenure 4 years, 4 months)
|
89
|
Strom Thurmond (D-SC)
|
Previously a senator (1 year, 3 months)
|
91
|
Thruston Ballard Morton (R-KY)
|
January 3, 1957
|
Former representative (6 years)
|
90
|
John A. Carroll (D-CO)
|
Former representative (4 years)
|
92
|
Frank J. Lausche (D-OH)
|
Former governor, Ohio 5th in population (1950)
|
93
|
Herman Talmadge (D-GA)
|
Former governor, Georgia 13th in population (1950)
|
94
|
Joseph S. Clark (D-PA)
|
Pennsylvania 3rd in population (1950)
|
95
|
Frank Church (D-ID)
|
Idaho 43rd in population (1950)
|
96
|
Jacob K. Javits (R-NY)
|
January 9, 1957
|
Former representative (7 years)
|
|
William A. Blakley[12] (D-TX)
|
January 15, 1957
|
|
Ralph Yarborough (D-TX)
|
April 29, 1957
|
|
William Proxmire (D-WI)
|
August 28, 1957
|
|
John D. Hoblitzell, Jr. (R-WV)
|
January 25, 1958
|
|
Ben Jordan (D-NC)
|
April 19, 1958
|
|
Jennings Randolph (D-WV)
|
November 5, 1958
|
Former representative (14 years)
|