Rank
|
Historical rank
|
Senator (party-state)
|
Seniority date
|
Other factors
|
1
|
1248
|
Carl Hayden (D-AZ)
|
March 4, 1927
|
Former representative (15 years)
|
2
|
1306
|
Richard Russell, Jr. (D-GA)
|
January 12, 1933
|
Former governor
|
3
|
1311
|
Harry F. Byrd, Sr.[8] (D-VA)
|
March 4, 1933
|
Former governor
|
4
|
1352
|
Allen J. Ellender (D-LA)
|
January 3, 1937
|
5
|
1365
|
Joseph L. Hill (D-AL)
|
January 11, 1938
|
Former representative (15 years)
|
6
|
1399
|
George Aiken (R-VT)
|
January 10, 1941
|
Former governor
|
7
|
1403[9]
|
James Eastland (D-MS)
|
January 3, 1943
|
Previously a senator
|
8
|
1417
|
John Little McClellan (D-AR)
|
Former representative (4 years)
|
9
|
1430
|
Warren G. Magnuson (D-WA)
|
December 14, 1944
|
Former representative (7 years)
|
10
|
1432
|
J. William Fulbright (D-AR)
|
January 3, 1945
|
Former representative
|
11
|
1433
|
Bourke B. Hickenlooper (R-IA)
|
Former governor, Iowa 20th in population (1940)
|
12
|
1435
|
Olin D. Johnston[10] (D-SC)
|
Former governor, South Carolina 26th in population (1940)
|
13
|
1437
|
Wayne Morse (D-OR)
|
14
|
1441
|
Leverett Saltonstall (R-MA)
|
January 4, 1945
|
Former governor
|
15
|
1446
|
Milton Young (R-ND)
|
March 12, 1945
|
16
|
1454
|
Spessard Holland (D-FL)
|
September 24, 1946
|
Former governor
|
17
|
1458
|
A. Willis Robertson (D-VA)
|
November 6, 1946
|
Former representative (13 years, 10 months)
|
18
|
1459
|
John Sparkman (D-AL)
|
Former representative (9 years, 10 months)
|
19
|
1475
|
John J. Williams (R-DE)
|
January 3, 1947
|
20
|
1476
|
John C. Stennis (D-MS)
|
November 17, 1947
|
21
|
1480
|
Karl Mundt (R-SD)
|
December 31, 1948
|
Former representative
|
22
|
1481
|
Russell B. Long (D-LA)
|
23
|
1485
|
Margaret Chase Smith (R-ME)
|
January 3, 1949
|
Former representative
|
24
|
1486
|
Clinton Anderson (D-NM)
|
Former cabinet secretary, Former representative (4 years, 5 months)
|
25
|
1490
|
Paul Douglas (D-IL)
|
26
|
1504
|
Frank Carlson (R-KS)
|
November 27, 1950
|
Former representative (12 years), Former governor
|
27
|
1506
|
John O. Pastore (D-RI)
|
December 19, 1950
|
28
|
1507
|
Everett Dirksen (R-IL)
|
January 3, 1951
|
Former representative (16 years)
|
29
|
1509
|
Almer Monroney (D-OK)
|
Former representative (12 years)
|
30
|
1511
|
George Smathers (D-FL)
|
Former representative (4 years)
|
31
|
1513
|
Wallace F. Bennett (R-UT)
|
32
|
1523
|
Thomas Kuchel (R-CA)
|
January 2, 1953
|
33
|
1524
|
Albert Gore, Sr. (D-TN)
|
January 3, 1953
|
Former representative (14 years)
|
34
|
1525
|
Henry M. Jackson (D-WA)
|
Former representative (12 years)
|
35
|
1528
|
Mike Mansfield (D-MT)
|
Former representative (10 years)
|
36
|
1533
|
Stuart Symington (D-MO)
|
37
|
1538
|
Sam Ervin (D-NC)
|
June 5, 1954
|
38
|
1544
|
Norris Cotton (R-NH)
|
November 8, 1954
|
Former representative (7 years, 10 months)
|
39
|
1545
|
Roman Hruska (R-NE)
|
Former representative (1 year, 10 months)
|
40
|
1547
|
Alan Bible (D-NV)
|
December 2, 1954
|
41
|
1550
|
Carl Curtis (R-NE)
|
January 1, 1955
|
Former representative (15 years)
|
42
|
1551
|
Clifford P. Case (R-NJ)
|
January 3, 1955
|
Former representative
|
43
|
1553
|
Patrick V. McNamara[11] (D-MI)
|
Maryland 24th in population (1950)
|
44
|
1555
|
Gordon L. Allott (R-CO)
|
Colorado 32nd in population (1950)
|
45
|
1456[12]
|
John Sherman Cooper (R-KY)
|
November 7, 1956
|
Previously a senator (twice) (total tenure 4 years, 4 months)
|
46
|
1549[13]
|
Strom Thurmond (R-SC)
|
Previously a senator (1 year, 3 months)
|
47
|
1559
|
Thruston Ballard Morton (R-KY)
|
January 3, 1957
|
Former representative
|
48
|
1561
|
Frank J. Lausche (D-OH)
|
Former governor, Ohio 5th in population (1950)
|
49
|
1562
|
Herman Talmadge (D-GA)
|
Former governor, Georgia 13th in population (1950)
|
50
|
1563
|
Joseph S. Clark (D-PA)
|
Pennsylvania 3rd in population (1950)
|
51
|
1564
|
Frank Church (D-ID)
|
Idaho 43rd in population (1950)
|
52
|
1565
|
Jacob K. Javits (R-NY)
|
January 9, 1957
|
Former representative (7 years)
|
53
|
1567
|
Ralph Yarborough (D-TX)
|
April 29, 1957
|
54
|
1568
|
William Proxmire (D-WI)
|
August 28, 1957
|
55
|
1570
|
Ben Jordan (D-NC)
|
April 19, 1958
|
56
|
1571
|
Jennings Randolph (D-WV)
|
November 5, 1958
|
Former representative (14 years)
|
57
|
1572
|
Hugh Scott (R-PA)
|
January 3, 1959
|
Former representative (18 years)
|
58
|
1575
|
Eugene McCarthy (D-MN)
|
Former representative (10 years)
|
59
|
1576
|
Stephen Young (D-OH)
|
Former representative (8 years), Ohio 5th in population (1950)
|
60
|
1577
|
Winston L. Prouty (R-VT)
|
Former representative (8 years), Vermont 46th in population (1950)
|
61
|
1578
|
Robert Byrd (D-WV)
|
Former representative (6 years)
|
62
|
1579
|
Harrison A. Williams (D-NJ)
|
Former representative (4 years), New Jersey 8th in population (1950)
|
63
|
1580
|
Thomas J. Dodd (D-CT)
|
Former representative (4 years), Connecticut 34th in population (1950)
|
64
|
1581
|
Edward L. Bartlett (D-AK)
|
Former delegate
|
65
|
1582
|
Edmund Muskie (D-ME)
|
Former governor, Maine 35th in population (1950)
|
66
|
1583
|
Ernest Gruening (D-AK)
|
Former Territorial Governor, Alaska 50th in population (1950)
|
67
|
1584
|
Philip Hart (D-MI)
|
Michigan 7th in population (1950)
|
68
|
1585
|
Vance Hartke (D-IN)
|
Indiana 11th in population (1950)
|
69
|
1586
|
Frank Moss (D-UT)
|
Utah 38th in population (1950)
|
70
|
1587
|
Gale W. McGee (D-WY)
|
Wyoming 48th in population (1950)
|
71
|
1588
|
Howard Cannon (D-NV)
|
Nevada 49th in population (1950)
|
72
|
1590
|
Hiram Fong (R-HI)
|
August 21, 1959
|
73
|
1593
|
Quentin Northrup Burdick (D-ND)
|
August 8, 1960
|
Former representative
|
74
|
1594
|
Edward V. Long (D-MO)
|
September 23, 1960
|
75
|
1595
|
Maurine Neuberger (D-OR)
|
November 9, 1960
|
76
|
1597
|
Lee Metcalf (D-MT)
|
January 3, 1961
|
Former representative (8 years)
|
77
|
1598
|
James Boggs (R-DE)
|
Former representative (6 years)
|
78
|
1600
|
Jack Miller (R-IA)
|
Iowa 22nd in population (1950)
|
79
|
1601
|
Claiborne Pell (D-RI)
|
Rhode Island 36th in population (1950)
|
80
|
1602
|
John Tower (R-TX)
|
June 15, 1961
|
81
|
1604
|
James B. Pearson (R-KS)
|
January 31, 1962
|
82
|
1606
|
Leonard B. Jordan (R-ID)
|
August 6, 1962
|
83
|
1607
|
Milward L. Simpson (R-WY)
|
November 7, 1962
|
Former governor
|
84
|
1608
|
Ted Kennedy (D-MA)
|
Massachusetts 9th in population (1960)
|
85
|
1609
|
Thomas J. McIntyre (D-NH)
|
New Hampshire 45th in population (1960)
|
86
|
1611
|
Abraham A. Ribicoff (D-CT)
|
January 3, 1963
|
Former representative (4 years), former cabinet secretary, former governor
|
87
|
1612
|
Daniel Brewster (D-MD)
|
Former representative (4 years) - Maryland 21st in population (1960)
|
88
|
1613
|
George McGovern (D-SD)
|
Former representative (4 years) - South Dakota 40th in population (1960)
|
89
|
1614
|
Daniel Inouye (D-HI)
|
Former representative (4 years) - Hawaii 43rd in population (1960)
|
90
|
1615
|
Peter H. Dominick (R-CO)
|
Former representative (2 years)
|
91
|
1616
|
Birch Bayh (D-IN)
|
92
|
1618
|
Gaylord Nelson (D-WI)
|
January 7, 1963
|
Former governor
|
93
|
1621
|
Ross Bass (D-TN)
|
November 4, 1964
|
Former representative (9 years, 10 months)
|
94
|
1622
|
Joseph Montoya (D-NM)
|
Former representative (7 years)
|
95
|
1623
|
Fred R. Harris (D-OK)
|
96
|
1624
|
Walter Mondale (D-MN)
|
December 30, 1964
|
97
|
1625
|
George Murphy (R-CA)
|
January 1, 1965
|
98
|
1626
|
Joseph Tydings (D-MD)
|
January 3, 1965
|
Former representative
|
99
|
1627
|
Robert F. Kennedy (D-NY)
|
Former cabinet member
|
100
|
1628
|
Paul Fannin (R-AZ)
|
Former governor
|
101
|
1629
|
Donald S. Russell (D-SC)
|
April 22, 1965
|
102
|
1630
|
Harry F. Byrd, Jr. (D-VA)
|
November 12, 1965
|
103
|
1631
|
Robert P. Griffin (R-MI)
|
May 11, 1966
|
104
|
1632
|
Ernest Hollings (D-SC)
|
November 9, 1966
|
Former governor
|
105
|
1633
|
William B. Spong, Jr. (D-VA)
|
December 31, 1966
|