Rank
|
Historical rank
|
Senator
|
Party
|
State
|
Seniority date
|
Other factors
|
1
|
1692
|
Patrick Leahy
|
Democratic
|
Vermont
|
January 3, 1975
|
|
2
|
1743
|
Chuck Grassley
|
Republican
|
Iowa
|
January 3, 1981
|
|
3
|
1766
|
Mitch McConnell
|
Republican
|
Kentucky
|
January 3, 1985
|
|
4
|
1775
|
Richard Shelby
|
Republican
|
Alabama
|
January 3, 1987
|
|
5
|
1801
|
Dianne Feinstein
|
Democratic
|
California
|
November 10, 1992
|
|
6
|
1810
|
Patty Murray
|
Democratic
|
Washington
|
January 3, 1993
|
|
7
|
1816
|
Jim Inhofe
|
Republican
|
Oklahoma
|
November 17, 1994
|
|
8
|
1827
|
Ron Wyden
|
Democratic
|
Oregon
|
February 6, 1996
|
|
9
|
1830
|
Pat Roberts
|
Republican
|
Kansas
|
January 3, 1997
|
Former member of the U.S. House of Representatives (16 years)
|
10
|
1831
|
Dick Durbin
|
Democratic
|
Illinois
|
Former member of the U.S. House of Representatives (14 years)
|
11
|
1835
|
Jack Reed
|
Democratic
|
Rhode Island
|
Former member of the U.S. House of Representatives (6 years)
|
12
|
1842
|
Susan Collins
|
Republican
|
Maine
|
Maine 38th in population (1990)
|
13
|
1843
|
Mike Enzi
|
Republican
|
Wyoming
|
Wyoming 50th in population (1990)
|
14
|
1844
|
Chuck Schumer
|
Democratic
|
New York
|
January 3, 1999
|
Former member of the U.S. House of Representatives (18 years)
|
15
|
1846
|
Mike Crapo
|
Republican
|
Idaho
|
Former member of the U.S. House of Representatives (6 years)
|
16
|
1855
|
Tom Carper
|
Democratic
|
Delaware
|
January 3, 2001
|
Former member of the U.S. House of Representatives (10 years)
|
17
|
1856
|
Debbie Stabenow
|
Democratic
|
Michigan
|
Former member of the U.S. House of Representatives (4 years)
|
18
|
1859
|
Maria Cantwell
|
Democratic
|
Washington
|
Former member of the U.S. House of Representatives (2 years)
|
19
|
1873
|
John Cornyn
|
Republican
|
Texas
|
December 1, 2002
|
|
20
|
1867
|
Lisa Murkowski
|
Republican
|
Alaska
|
December 20, 2002
|
|
21
|
1869
|
Lindsey Graham
|
Republican
|
South Carolina
|
January 3, 2003
|
Former member of the U.S. House of Representatives
|
22
|
1871
|
Lamar Alexander
|
Republican
|
Tennessee
|
|
23
|
1876
|
Richard Burr
|
Republican
|
North Carolina
|
January 3, 2005
|
Former member of the U.S. House of Representatives (10 years)
|
24
|
1879
|
John Thune
|
Republican
|
South Dakota
|
Former member of the U.S. House of Representatives (6 years)
|
25
|
1880
|
Johnny Isakson[a] |
Republican
|
Georgia
|
Former member of the U.S. House of Representatives (5 years, 10 months)
|
26
|
1885
|
Bob Menendez
|
Democratic
|
New Jersey
|
January 18, 2006
|
|
27
|
1886
|
Ben Cardin
|
Democratic
|
Maryland
|
January 3, 2007
|
Former member of the U.S. House of Representatives (20 years)
|
28
|
1887
|
Bernie Sanders
|
Independent
|
Vermont
|
Former member of the U.S. House of Representatives (16 years)[b] |
29
|
1888
|
Sherrod Brown
|
Democratic
|
Ohio
|
Former member of the U.S. House of Representatives (14 years)
|
30
|
1890
|
Bob Casey Jr.
|
Democratic
|
Pennsylvania
|
Pennsylvania 6th in population (2000)
|
31
|
1893
|
Amy Klobuchar
|
Democratic
|
Minnesota
|
Minnesota 21st in population (2000)
|
32
|
1894
|
Sheldon Whitehouse
|
Democratic
|
Rhode Island
|
Rhode Island 43rd in population (2000)
|
33
|
1895
|
Jon Tester
|
Democratic
|
Montana
|
Montana 44th in population (2000)
|
34
|
1896
|
John Barrasso
|
Republican
|
Wyoming
|
June 25, 2007
|
|
35
|
1897
|
Roger Wicker
|
Republican
|
Mississippi
|
December 31, 2007
|
|
36
|
1899
|
Tom Udall
|
Democratic
|
New Mexico
|
January 3, 2009
|
Former member of the U.S. House of Representatives
|
37
|
1901
|
Jeanne Shaheen
|
Democratic
|
New Hampshire
|
Former governor (6 years)
|
38
|
1902
|
Mark Warner
|
Democratic
|
Virginia
|
Former governor (4 years)
|
39
|
1903
|
Jim Risch
|
Republican
|
Idaho
|
Former governor (7 months)
|
40
|
1905
|
Jeff Merkley
|
Democratic
|
Oregon
|
|
41
|
1909
|
Michael Bennet
|
Democratic
|
Colorado
|
January 21, 2009
|
|
42
|
1910
|
Kirsten Gillibrand
|
Democratic
|
New York
|
January 26, 2009
|
|
43
|
1916
|
Joe Manchin
|
Democratic
|
West Virginia
|
November 15, 2010
|
Former governor
|
44
|
1917
|
Chris Coons
|
Democratic
|
Delaware
|
|
45
|
1919
|
Roy Blunt
|
Republican
|
Missouri
|
January 3, 2011
|
Former member of the U.S. House of Representatives (14 years); Missouri 17th in population (2000)
|
46
|
1920
|
Jerry Moran
|
Republican
|
Kansas
|
Former member of the U.S. House of Representatives (14 years); Kansas 32nd in population (2000)
|
47
|
1921
|
Rob Portman
|
Republican
|
Ohio
|
Former member of the U.S. House of Representatives (12 years)
|
48
|
1922
|
John Boozman
|
Republican
|
Arkansas
|
Former member of the U.S. House of Representatives (9 years)
|
49
|
1923
|
Pat Toomey
|
Republican
|
Pennsylvania
|
Former member of the U.S. House of Representatives (6 years)
|
50
|
1924
|
John Hoeven
|
Republican
|
North Dakota
|
Former governor
|
51
|
1925
|
Marco Rubio
|
Republican
|
Florida
|
Florida 4th in population (2000)
|
52
|
1926
|
Ron Johnson
|
Republican
|
Wisconsin
|
Wisconsin 18th in population (2000)
|
53
|
1927
|
Rand Paul
|
Republican
|
Kentucky
|
Kentucky 25th in population (2000)
|
54
|
1928
|
Richard Blumenthal
|
Democratic
|
Connecticut
|
Connecticut 29th in population (2000)
|
55
|
1929
|
Mike Lee
|
Republican
|
Utah
|
Utah 34th in population (2000)
|
56
|
1932
|
Brian Schatz
|
Democratic
|
Hawaii
|
December 27, 2012
|
|
57
|
1933
|
Tim Scott
|
Republican
|
South Carolina
|
January 2, 2013
|
|
58
|
1934
|
Tammy Baldwin
|
Democratic
|
Wisconsin
|
January 3, 2013
|
Former member of the U.S. House of Representatives (14 years)
|
59
|
1937
|
Chris Murphy
|
Democratic
|
Connecticut
|
Former member of the U.S. House of Representatives (6 years); Connecticut 29th in population (2010)
|
60
|
1938
|
Mazie Hirono
|
Democratic
|
Hawaii
|
Former member of the U.S. House of Representatives (6 years); Hawaii 42nd in population (2010)
|
61
|
1939
|
Martin Heinrich
|
Democratic
|
New Mexico
|
Former member of the U.S. House of Representatives (4 years)
|
62
|
1940
|
Angus King
|
Independent
|
Maine
|
Former governor (8 years)
|
63
|
1941
|
Tim Kaine
|
Democratic
|
Virginia
|
Former governor (4 years)
|
64
|
1942
|
Ted Cruz
|
Republican
|
Texas
|
Texas 2nd in population (2010)
|
65
|
1943
|
Elizabeth Warren
|
Democratic
|
Massachusetts
|
Massachusetts 15th in population (2010)
|
66
|
1944
|
Deb Fischer
|
Republican
|
Nebraska
|
Nebraska 38th in population (2010)
|
67
|
1948
|
Ed Markey
|
Democratic
|
Massachusetts
|
July 16, 2013
|
Former member of the U.S. House of Representatives
|
68
|
1949
|
Cory Booker
|
Democratic
|
New Jersey
|
October 31, 2013
|
|
69
|
1951
|
Shelley Moore Capito
|
Republican
|
West Virginia
|
January 3, 2015
|
Former member of the U.S. House of Representatives (14 years)
|
70
|
1952
|
Gary Peters
|
Democratic
|
Michigan
|
Former member of the U.S. House of Representatives (6 years); Michigan 9th in population (2010)
|
71
|
1953
|
Bill Cassidy
|
Republican
|
Louisiana
|
Former member of the U.S. House of Representatives (6 years); Louisiana 25th in population (2010)
|
72
|
1954
|
Cory Gardner
|
Republican
|
Colorado
|
Former member of the U.S. House of Representatives (4 years); Colorado 22nd in population (2010)
|
73
|
1955
|
James Lankford
|
Republican
|
Oklahoma
|
Former member of the U.S. House of Representatives (4 years); Oklahoma 28th in population (2010)
|
74
|
1956
|
Tom Cotton
|
Republican
|
Arkansas
|
Former member of the U.S. House of Representatives (2 years); Arkansas 32nd in population (2010)
|
75
|
1957
|
Steve Daines
|
Republican
|
Montana
|
Former member of the U.S. House of Representatives (2 years); Montana 44th in population (2010)
|
76
|
1958
|
Mike Rounds
|
Republican
|
South Dakota
|
Former governor
|
77
|
1959
|
David Perdue
|
Republican
|
Georgia
|
Georgia 8th in population (2010)
|
78
|
1960
|
Thom Tillis
|
Republican
|
North Carolina
|
North Carolina 10th in population (2010)
|
79
|
1961
|
Joni Ernst
|
Republican
|
Iowa
|
Iowa 30th in population (2010)
|
80
|
1962
|
Ben Sasse
|
Republican
|
Nebraska
|
Nebraska 38th in population (2010)
|
81
|
1963
|
Dan Sullivan
|
Republican
|
Alaska
|
Alaska 47th in population (2010)
|
82
|
1964
|
Chris Van Hollen
|
Democratic
|
Maryland
|
January 3, 2017
|
Former member of the U.S. House of Representatives (14 years)
|
83
|
1965
|
Todd Young
|
Republican
|
Indiana
|
Former member of the U.S. House of Representatives (6 years)
|
84
|
1966
|
Tammy Duckworth
|
Democratic
|
Illinois
|
Former member of the U.S. House of Representatives (4 years)
|
85
|
1967
|
Maggie Hassan
|
Democratic
|
New Hampshire
|
Former governor
|
86
|
1968
|
Kamala Harris
|
Democratic
|
California
|
California 1st in population (2010)
|
87
|
1969
|
John Neely Kennedy
|
Republican
|
Louisiana
|
Louisiana 25th in population (2010)
|
88
|
1970
|
Catherine Cortez Masto
|
Democratic
|
Nevada
|
Nevada 35th in population (2010)
|
89
|
1972
|
Tina Smith
|
Democratic
|
Minnesota
|
January 3, 2018
|
Minnesota 21st in population (2010)
|
90
|
1973
|
Doug Jones
|
Democratic
|
Alabama
|
Alabama 23rd in population (2010)
|
91
|
1974
|
Cindy Hyde-Smith
|
Republican
|
Mississippi
|
April 2, 2018
|
|
92
|
1975
|
Marsha Blackburn
|
Republican
|
Tennessee
|
January 3, 2019
|
Former member of the U.S. House of Representatives (16 years)
|
93
|
1976
|
Kyrsten Sinema
|
Democratic
|
Arizona
|
Former member of the U.S. House of Representatives (6 years); Arizona 16th in population (2010)
|
94
|
1977
|
Kevin Cramer
|
Republican
|
North Dakota
|
Former member of the U.S. House of Representatives (6 years); North Dakota 48th in population (2010)
|
95
|
1978
|
Martha McSally[c] |
Republican
|
Arizona
|
Former member of the U.S. House of Representatives (4 years)
|
96
|
1979
|
Jacky Rosen
|
Democratic
|
Nevada
|
Former member of the U.S. House of Representatives (2 years)
|
97
|
1980
|
Mitt Romney
|
Republican
|
Utah
|
Former governor
|
98
|
1981
|
Mike Braun
|
Republican
|
Indiana
|
Indiana 15th in population (2010)
|
99
|
1982
|
Josh Hawley
|
Republican
|
Missouri
|
Missouri 18th in population (2010)
|
100
|
1983
|
Rick Scott
|
Republican
|
Florida
|
January 8, 2019
|
|
101
|
1984
|
Kelly Loeffler[a] |
Republican
|
Georgia
|
January 6, 2020
|
|
102
|
1985
|
Mark Kelly[c] |
Democratic
|
Arizona
|
December 2, 2020
|
|
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