Rank
|
Dates of Service
|
State
|
Senator
|
1
|
Jan 3, 1959-Jun 28, 2010
|
West Virginia
|
Robert Byrd
|
2
|
Jan 3, 1963-Dec 17, 2012
|
Hawaii
|
Daniel Inouye
|
3
|
Dec 14, 1954-Apr 4, 1956 and Nov 7, 1956-Jan 3, 2003
|
South Carolina
|
Strom Thurmond
|
4
|
Nov 7, 1962-Aug 25, 2009
|
Massachusetts
|
Ted Kennedy
|
5
|
Jan 3, 1975-present
|
Vermont
|
Patrick Leahy
|
6
|
Jan 3, 1977-Jan 3, 2019
|
Utah
|
Orrin Hatch
|
7
|
Mar 4, 1927-Jan 3, 1969
|
Arizona
|
Carl Hayden
|
8
|
Nov 5, 1947-Jan 3, 1989
|
Mississippi
|
John C. Stennis
|
9
|
Dec 24, 1968-Jan 3, 2009
|
Alaska
|
Ted Stevens
|
11
|
Jan 3, 1981 - Present
|
Iowa
|
Chuck Grassley
|
10
|
Dec 27, 1978-Apr 1, 2018
|
Mississippi
|
Thad Cochran
|
12
|
Nov 9, 1966-Jan 3, 2005
|
South Carolina
|
Fritz Hollings
|
13
|
Jan 12, 1933-Jan 21, 1971
|
Georgia
|
Richard Russell, Jr.
|
14
|
Dec 31, 1948-Jan 3, 1987
|
Louisiana
|
Russell B. Long
|
15
|
Nov 18, 1890-Mar 3, 1893 and Mar 4, 1895-Nov 24, 1929
|
Wyoming
|
Francis E. Warren
|
16
|
Jun 30, 1941-Sep 28, 1941 and Jan 3, 1943-Dec 27, 1978
|
Mississippi
|
James Eastland
|
17
|
Dec 14, 1944-Jan 3,1981
|
Washington
|
Warren Magnuson
|
18
|
Jan 3, 1973-Jan 15, 2009
|
Delaware
|
Joe Biden
|
19
|
Jan 3, 1973-Jan 3, 2009
|
New Mexico
|
Pete Domenici
|
19
|
Jan 3, 1979-Jan 3, 2015
|
Michigan
|
Carl Levin
|
19
|
Jan 3, 1977-Jan 3, 2013
|
Indiana
|
Richard Lugar
|
19
|
Jan 3, 1961-Jan 3, 1997
|
Rhode Island
|
Claiborne Pell
|
23
|
Mar 4, 1917-Jan 3, 1953
|
Tennessee
|
Kenneth McKellar
|
24
|
Mar 12, 1945-Jan 3, 1981
|
North Dakota
|
Milton Young
|
25
|
Mar 4, 1909-Nov 17, 1944
|
South Carolina
|
Ellison D. Smith
|
|