Rank |
Senator (party-state) |
Seniority date |
Other factors |
1 |
Robert Byrd[9] (D-WV) |
January 3, 1959 |
Former U.S. Representative |
2 |
Ted Kennedy[10] (D-MA) |
November 7, 1962 |
|
3 |
Daniel Inouye (D-HI) |
January 3, 1963 |
Former U.S. Representative |
4 |
Joe Biden[11] (D-DE) |
January 3, 1973 |
5 |
Patrick Leahy (D-VT) |
January 3, 1975 |
6 |
Richard Lugar (R-IN) |
January 3, 1977 |
Indiana 11th in population (1970) |
7 |
Orrin Hatch (R-UT) |
Utah 36th in population (1970) |
8 |
Max Baucus (D-MT) |
December 15, 1978 |
Former U.S. Representative |
9 |
Thad Cochran (R-MS) |
December 27, 1978 |
Former U.S. Representative |
10 |
Carl Levin (D-MI) |
January 3, 1979 |
11 |
Chris Dodd (D-CT) |
January 3, 1981 |
Former U.S. Representative (6 years); Connecticut 24th in population (1970) |
12 |
Chuck Grassley (R-IA) |
Former U.S. Representative (6 years); Iowa 25th in population (1970) |
13 |
Arlen Specter (R, D[12]-PA) |
|
14 |
Jeff Bingaman (D-NM) |
January 3, 1983 |
15 |
John Kerry (D-MA) |
January 2, 1985 |
16 |
Tom Harkin (D-IA) |
January 3, 1985 |
Former U.S. Representative |
17 |
Mitch McConnell (R-KY) |
|
18 |
Jay Rockefeller (D-WV) |
January 15, 1985 |
Former governor |
19 |
Barbara Mikulski (D-MD) |
January 3, 1987 |
Former U.S. Representative (10 years) |
20 |
Richard Shelby (R-AL) |
Former U.S. Representative (8 years) |
21 |
John McCain (R-AZ) |
Former U.S. Representative (4 years); Arizona 29th in population (1980) |
22 |
Harry Reid (D-NV) |
Former U.S. Representative (4 years); Nevada 43rd in population (1980) |
23 |
Kit Bond (R-MO) |
Former governor |
24 |
Kent Conrad (D-ND) |
|
25 |
Herb Kohl (D-WI) |
January 3, 1989 |
Wisconsin 16th in population (1980) |
26 |
Joe Lieberman (I-CT)[13] |
Connecticut 25th in population (1980) |
27 |
Daniel Akaka (D-HI) |
May 16, 1990 |
Former U.S. Representative |
28 |
Dianne Feinstein (D-CA) |
November 10, 1992 |
|
29 |
Byron Dorgan (D-ND) |
December 15, 1992 |
Former U.S. Representative |
30 |
Barbara Boxer (D-CA) |
January 3, 1993 |
Former U.S. Representative (10 years) |
31 |
Judd Gregg (R-NH) |
Former U.S. Representative (8 years) |
32 |
Russ Feingold (D-WI) |
Wisconsin 16th in population (1990) |
33 |
Patty Murray (D-WA) |
Washington 18th in population (1990) |
34 |
Bob Bennett (R-UT) |
Utah 35th in population (1990) |
35 |
Kay Bailey Hutchison (R-TX) |
June 14, 1993 |
|
36 |
Jim Inhofe (R-OK) |
November 17, 1994 |
Former U.S. Representative |
37 |
Olympia Snowe (R-ME) |
January 3, 1995 |
Former U.S. Representative (16 years) |
38 |
Jon Kyl (R-AZ) |
Former U.S. Representative (8 years) |
39 |
Ron Wyden (D-OR) |
February 6, 1996 |
Former U.S. Representative |
40 |
Sam Brownback (R-KS) |
November 7, 1996 |
Former U.S. Representative |
41 |
Pat Roberts (R-KS) |
January 3, 1997 |
Former U.S. Representative (16 years) |
42 |
Dick Durbin (D-IL) |
Former U.S. Representative (14 years) |
43 |
Tim Johnson (D-SD) |
Former U.S. Representative (10 years) |
44 |
Jack Reed (D-RI) |
Former U.S. Representative (6 years) |
45 |
Mary Landrieu (D-LA) |
Louisiana 21st in population (1990) |
46 |
Jeff Sessions (R-AL) |
Alabama 22nd in population (1990) |
47 |
Susan Collins (R-ME) |
Maine 38th in population (1990) |
48 |
Mike Enzi (R-WY) |
Wyoming 50th in population (1990) |
49 |
Chuck Schumer (D-NY) |
January 3, 1999 |
Former U.S. Representative (18 years) |
50 |
Jim Bunning (R-KY) |
Former U.S. Representative (12 years) |
51 |
Mike Crapo (R-ID) |
Former U.S. Representative (6 years) |
52 |
Blanche Lincoln (D-AR) |
Former U.S. Representative (4 years) |
53 |
George Voinovich (R-OH) |
Former governor; Ohio 7th in population (1990) |
54 |
Evan Bayh (D-IN) |
Former governor; Indiana 15th in population (1990) |
55 |
Bill Nelson (D-FL) |
January 3, 2001 |
Former U.S. Representative (12 years) |
56 |
Tom Carper (D-DE) |
Former U.S. Representative (10 years) |
57 |
Debbie Stabenow (D-MI) |
Former U.S. Representative (4 years); Michigan 8th in population (1990) |
58 |
John Ensign (R-NV) |
Former U.S. Representative (4 years); Nevada 39th in population (1990) |
59 |
Maria Cantwell (D-WA) |
Former U.S. Representative (2 years) |
60 |
Ben Nelson (D-NE) |
Former governor |
61 |
Hillary Clinton[14][15] (D-NY) |
|
62 |
John Cornyn (R-TX) |
December 2, 2002 |
|
63 |
Lisa Murkowski (R-AK) |
December 20, 2002 |
64 |
Frank Lautenberg[16] (D-NJ) |
January 3, 2003 |
Previously a Senator |
65 |
Saxby Chambliss (R-GA) |
Former U.S. Representative (8 years); Georgia 10th in population (2000) |
66 |
Lindsey Graham (R-SC) |
Former U.S. Representative (8 years); South Carolina 26th in population (2000) |
67 |
Lamar Alexander (R-TN) |
Former cabinet member |
68 |
Mark Pryor (D-AR) |
|
69 |
Richard Burr (R-NC) |
January 3, 2005 |
Former U.S. Representative (10 years) |
70 |
Jim DeMint (R-SC) |
Former U.S. Representative (6 years); South Carolina 26th in population (2000) |
71 |
Tom Coburn (R-OK) |
Former U.S. Representative (6 years); Oklahoma 27th in population (2000) |
72 |
John Thune (R-SD) |
Former U.S. Representative (6 years); South Dakota 46th in population (2000) |
73 |
Johnny Isakson (R-GA) |
Former U.S. Representative (5 years, 10 months) |
74 |
David Vitter (R-LA) |
Former U.S. Representative (5 years, 7 months) |
75 |
Mel Martinez[17] (R-FL) |
Former cabinet member |
76 |
Ken Salazar[18] (D-CO) |
|
77 |
Bob Menendez (D-NJ) |
January 17, 2006 |
Former U.S. Representative |
78 |
Ben Cardin (D-MD) |
January 3, 2007 |
Former U.S. Representative (20 years) |
79 |
Bernie Sanders (I-VT) |
Former U.S. Representative (16 years) |
80 |
Sherrod Brown (D-OH) |
Former U.S. Representative (14 years) |
81 |
Bob Casey, Jr. (D-PA) |
Pennsylvania 6th in population (2000) |
82 |
Jim Webb[19] (D-VA) |
Virginia 12th in population (2000) |
83 |
Bob Corker (R-TN) |
Tennessee 16th in population (2000) |
84 |
Claire McCaskill (D-MO) |
Missouri 17th in population (2000) |
85 |
Amy Klobuchar (D-MN) |
Minnesota 21st in population (2000) |
86 |
Sheldon Whitehouse (D-RI) |
Rhode Island 43rd in population (2000) |
87 |
Jon Tester (D-MT) |
Montana 44th in population (2000) |
88 |
John Barrasso (R-WY) |
June 25, 2007 |
|
89 |
Roger Wicker (R-MS) |
December 31, 2007 |
Former U.S. Representative |
90 |
Mark Udall (D-CO) |
January 3, 2009 |
Former U.S. Representative (10 years); Colorado 24th in population (2000) |
91 |
Tom Udall (D-NM) |
Former U.S. Representative (10 years); New Mexico 36th in population (2000) |
92 |
Mike Johanns (R-NE) |
Former cabinet member |
93 |
Jeanne Shaheen (D-NH) |
Former governor (6 years) |
94 |
Mark Warner (D-VA) |
Former governor (4 years) |
95 |
Jim Risch (R-ID) |
Former governor (7 months) |
96 |
Kay Hagan (D-NC) |
North Carolina 11th in population (2000) |
97 |
Jeff Merkley (D-OR) |
Oregon 28th in population (2000) |
98 |
Mark Begich (D-AK) |
Alaska 48th in population (2000) |
99 |
Roland Burris (D-IL) |
January 12, 2009 |
|
100 |
Ted Kaufman (D-DE) |
January 15, 2009 |
101 |
Michael Bennet (D-CO) |
January 21, 2009 |
102 |
Kirsten Gillibrand (D-NY) |
January 26, 2009 |
Former U.S. Representative |
103 |
Al Franken (D-MN) |
July 7, 2009 |
104 |
George LeMieux (R-FL) |
September 10, 2009 |
105 |
Paul G. Kirk (D-MA) |
September 24, 2009 |
106 |
Scott Brown (R-MA) |
February 4, 2010 |
107 |
Carte Goodwin (D-WV) |
July 16, 2010 |
108 |
Joe Manchin (D-WV) |
November 15, 2010 |
Former governor |
109 |
Chris Coons (D-DE) |
|
110 |
Mark Kirk (R-IL) |
November 29, 2010 |
Former U.S. Representative |