Click here for an updated version of the Senate Seniority List.

Rankings are based on the date the oath of office was taken, except in cases when a Senator resigns after the election and the winner of the election is appointed to fill the remainder of the term. For Senators sworn in on the same date, seniority is determined by prior Senate service, followed by vice presidential, House, Cabinet and gubernatorial service, according to the Senate Rules and Administration Committee. If ties remain, seniority is based first on state population and then alphabetically, if there are two Senators from the same state. The panel provided the ranking information but as a matter of committee policy would not confirm the list.

Updated: Aug. 11, 10:53 a.m.

1. Robert Byrd (D-W.Va.), Jan. 7, 1959
2. Edward Kennedy (D-Mass.), Nov. 7, 1962
3. Daniel Inouye (D-Hawaii), Jan. 9, 1963
4. Patrick Leahy (D-Vt.), Jan. 3, 1975
5. Dick Lugar (R-Ind.), Jan. 3, 1977
6. Orrin Hatch (R-Utah), Jan. 3, 1977
7. Max Baucus (D-Mont.), Dec. 15, 1978
8. Thad Cochran (R-Miss.), Dec. 27, 1978
9. Carl Levin (D-Mich.), Jan. 3, 1979
10. Chris Dodd (D-Conn.), Jan. 3, 1981
11. Chuck Grassley (R-Iowa), Jan. 3, 1981
12. Arlen Specter (D-Pa.), Jan. 3, 1981
13. Jeff Bingaman (D-N.M.), Jan. 3, 1983
14. John Kerry (D-Mass.), Jan. 3, 1985
15. Tom Harkin (D-Iowa), Jan. 3, 1985
16. Mitch McConnell (R-Ky.), Jan. 3, 1985
17. Jay Rockefeller (D-W.Va.), Jan. 15, 1985
18. Barbara Mikulski (D-Md.), Jan. 6, 1987
19. Richard Shelby (R-Ala.), Jan. 6, 1987
20. John McCain (R-Ariz.), Jan. 6, 1987
21. Harry Reid (D-Nev.), Jan. 6, 1987
22. Kit Bond (R-Mo.), Jan. 6, 1987
23. Kent Conrad (D-N.D.), Jan. 6, 1987
24. Herb Kohl (D-Wis.), Jan. 3, 1989
25. Joe Lieberman (ID-Conn.), Jan. 3, 1989
26. Daniel Akaka (D-Hawaii), April 28, 1990
27. Dianne Feinstein (D-Calif.), Nov. 10, 1992
28. Byron Dorgan (D-N.D.), Dec. 15, 1992
29. Barbara Boxer (D-Calif.), Jan. 5, 1993
30. Judd Gregg (R-N.H.), Jan. 5, 1993
31. Russ Feingold (D-Wis.), Jan. 5, 1993
32. Patty Murray (D-Wash.), Jan. 5, 1993
33. Bob Bennett (R-Utah), Jan. 5, 1993
34. Kay Bailey Hutchison (R-Texas), June 14, 1993
35. James Inhofe (R-Okla.), Nov. 30, 1994
36. Olympia Snowe (R-Maine), Jan. 4, 1995
37. Jon Kyl (R-Ariz.), Jan. 4, 1995
38. Ron Wyden (D-Ore.), Feb. 6, 1996
39. Sam Brownback (R-Kan.), Nov. 7, 1996
40. Pat Roberts (R-Kan.), Jan. 7, 1997
41. Dick Durbin (D-Ill.), Jan. 7, 1997
42. Tim Johnson (D-S.D.), Jan. 7, 1997
43. Jack Reed (D-R.I.), Jan. 7, 1997
44. Mary Landrieu (D-La.), Jan. 7, 1997
45. Jeff Sessions (R-Ala.), Jan. 7, 1997
46. Susan Collins (R-Maine), Jan. 7, 1997
47. Mike Enzi (R-Wyo.), Jan. 7, 1997
48. Charles Schumer (D-N.Y.), Jan. 3, 1999
49. Jim Bunning (R-Ky.), Jan. 3, 1999
50. Mike Crapo (R-Idaho), Jan. 3, 1999
51. Blanche Lincoln (D-Ark.), Jan. 3, 1999
52. Evan Bayh (D-Ind.), Jan. 3, 1999
53. George Voinovich (R-Ohio), Jan. 3, 1999
54. Ben Nelson (D-Neb.), Jan. 3, 2001
55. Tom Carper (D-Del.), Jan. 3, 2001
56. Debbie Stabenow (D-Mich.), Jan. 3, 2001
57. John Ensign (R-Nev.), Jan. 3, 2001
58. Maria Cantwell (D-Wash.), Jan. 3, 2001
59. Bill Nelson (D-Fla.), Jan. 3, 2001
60. Lisa Murkowski (R-Alaska), Dec. 20, 2002
61. Frank Lautenberg (D-N.J.), Jan. 3, 2003
62. Saxby Chambliss (R-Ga.), Jan. 3, 2003
63. Lindsey Graham (R-S.C.), Jan. 3, 2003
64. Lamar Alexander (R-Tenn.), Jan. 3, 2003
65. John Cornyn (R-Texas), Jan. 3, 2003
66. Mark Pryor (D-Ark.), Jan. 3, 2003
67. Richard Burr (R-N.C.), Jan. 4, 2005
68. Johnny Isakson (R-Ga.), Jan. 4, 2005
69. David Vitter (R-La.), Jan. 4, 2005
70. Jim DeMint (R-S.C.), Jan. 4, 2005
71. Tom Coburn (R-Okla.), Jan. 4, 2005
72. John Thune (R-S.D.), Jan. 4, 2005
73. Mel Martinez (R-Fla.), Jan. 4, 2005
74. Bob Menendez (D-N.J.), Jan. 18, 2006
75. Benjamin Cardin (D-Md.), Jan. 4, 2007
76. Bernie Sanders (I-Vt.), Jan. 4, 2007
77. Sherrod Brown (D-Ohio), Jan. 4, 2007
78. Jim Webb (D-Va.), Jan. 4, 2007
79. Bob Casey (D-Pa.), Jan. 4, 2007
80. Bob Corker (R-Tenn.), Jan. 4, 2007
81. Claire McCaskill (D-Mo.), Jan. 4, 2007
82. Amy Klobuchar (D-Minn.), Jan. 4, 2007
83. Sheldon Whitehouse (D-R.I.), Jan. 4, 2007
84. Jon Tester (D-Mont.), Jan. 4, 2007
85. John Barrasso (R-Wyo.), June 25, 2007
86. Roger Wicker (R-Miss.), Dec. 31, 2007
87. Mark Udall (D-Colo.), Jan. 6, 2009
88. Tom Udall (D-N.M.), Jan. 6, 2009
89. Mike Johanns (R-Neb.), Jan. 6, 2009
90. Jeanne Shaheen (D-N.H.), Jan. 6, 2009
91. Mark Warner (D-Va.), Jan. 6, 2009
92. James Risch (R-Idaho), Jan. 6, 2009
93. Kay Hagan (D-N.C.), Jan. 6, 2009
94. Jeff Merkley (D-Ore.), Jan. 6, 2009
95. Mark Begich (D-Alaska), Jan. 6, 2009
96. Roland Burris (D-Ill.), Jan. 15, 2009
97. Ted Kaufman (D-Del.), Jan. 16, 2009
98. Michael Bennet (D-Colo.), Jan. 22, 2009
99. Kirsten Gillibrand (D-N.Y.), Jan. 27, 2009
100. Al Franken (D-Minn.), July 7, 2009