State
|
Days of Service
|
Years
|
Senator
|
West Virginia
|
18,804
|
1959-2010
|
Robert Byrd
|
Hawaii
|
18,246
|
1963-2012
|
Daniel Inouye
|
Vermont
|
17,532
|
1975-2023
|
Patrick Leahy
|
South Carolina
|
17,314
|
1954-1956; 1956-2003
|
Strom Thurmond
|
Massachusetts
|
17,093
|
1962-2009
|
Ted Kennedy
|
Iowa
|
15,340+
|
1981-
|
Chuck Grassley
|
Utah
|
15,340
|
1977-2019
|
Orrin Hatch
|
Arizona
|
15,281
|
1927-1969
|
Carl Hayden
|
Mississippi
|
15,035
|
1947-1989
|
John C. Stennis
|
Alaska
|
14,620
|
1968-2009
|
Ted Stevens
|
Georgia
|
13,888
|
1933-1971
|
Richard Russell Jr.
|
Louisiana
|
13,882
|
1948-1987
|
Russell B. Long
|
Kentucky
|
13,879+
|
1985-
|
Mitch McConnell
|
Wyoming
|
13,519
|
1890-1893; 1895-1929
|
Francis E. Warren
|
Washington
|
13,169
|
1944-1981
|
Warren Magnuson
|
Delaware
|
13,161
|
1973-2009
|
Joe Biden
|
Alabama
|
13,149
|
1987-2023
|
Richard Shelby
|
Indiana
|
13,149
|
1977-2013
|
Richard Lugar
|
Michigan
|
13,149
|
1979-2015
|
Carl Levin
|
New Mexico
|
13,149
|
1973-2009
|
Pete Domenici
|
Rhode Island
|
13,149
|
1961-1997
|
Claiborne Pell
|
Tennessee
|
13,089
|
1917-1953
|
Kenneth McKellar
|
North Dakota
|
13,081
|
1945-1981
|
Milton Young
|
Montana
|
12,837
|
1978-2014
|
Max Baucus
|
Arkansas
|
12,748
|
1943-1977
|
John L. McClellan
|
Idaho
|
12,009
|
1907-1940
|
William Borah
|
Virginia
|
11,938
|
1933-1965
|
Harry F. Byrd
|
Ohio
|
11,675
|
1861-1877; 1881-1897
|
John Sherman
|
Wisconsin
|
11,451
|
1957-1989
|
William Proxmire
|
Maine
|
11,099
|
1881-1911
|
William P. Frye
|
California
|
11,017+
|
1992-
|
Dianne Feinstein
|
Nevada
|
10,959
|
1987-2017
|
Harry Reid
|
Maryland
|
10,958
|
1987-2017
|
Barbara Mikulski
|
Connecticut
|
10,957
|
1981-2011
|
Chris Dodd
|
North Carolina
|
10,957
|
1973-2003
|
Jesse Helms
|
Pennsylvania
|
10,957
|
1981-2011
|
Arlen Specter
|
Illinois
|
10,956
|
1883-1913
|
Shelby Moore Cullom
|
Missouri
|
10,956
|
1875-1905
|
Francis Cockrell
|
Oregon
|
10,951
|
1967-1997
|
Mark Hatfield
|
Kansas
|
10,898
|
1919-1949
|
Arthur Capper
|
Nebraska
|
10,897
|
1913-1943
|
George W. Norris
|
Colorado
|
10,738
|
1876-1882; 1885-1909
|
Henry M. Teller
|
New Jersey
|
10,388
|
1982-2001; 2003-2013
|
Frank Lautenberg
|
Texas
|
10,292
|
1913-1941
|
Morris Sheppard
|
Minnesota
|
10,281
|
1895-1923
|
Knute Nelson
|
Oklahoma
|
10,275
|
1994-2023
|
Jim Inhofe
|
New Hampshire
|
10,027
|
1891-1918
|
Jacob Harold Gallinger
|
Florida
|
9,967
|
1909-1936
|
Duncan U. Fletcher
|
South Dakota
|
8,769
|
1948-1973
|
Karl E. Mundt
|
New York
|
8,766+
|
1999-
|
Chuck Schumer
|
|