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Seniority in the United States Senate is valuable as it confers a number of benefits and is based on length of continuous service, with ties broken by a series of factors. Customarily, the terms "senior senator" and "junior senator" are used to distinguish the two senators representing a particular state.

Benefits of seniority[edit]

The United States Constitution does not mandate differences in rights or power, but Senate rules give more power to senators with more seniority. Generally, senior senators will have more power, especially within their own caucuses. In addition, by custom, senior senators from the president's party control federal patronage appointments in their states.

The president pro tempore of the Senate is traditionally the most senior member of the majority party.

There are several benefits, including the following:

  • Senators are given preferential treatment in choosing committee assignments based on seniority. Seniority on a committee is based on length of time serving on that committee, which means a senator may rank above another in committee seniority but be more junior in the full Senate. Although the committee chairmanship is an elected position, it is traditionally given to the most senior senator of the majority party serving on the committee, and not already holding a conflicting position such as chairmanship of another committee. The ranking member of a committee (called the vice-chairman in some select committees) is elected in the same way.
  • Greater seniority enables a senator to choose a desk closer to the front of the Senate Chamber.
  • Senators with higher seniority may choose to move into better office space as those offices are vacated.
  • Seniority determines the ranking in the United States order of precedence although other factors, such as being a former President or First Spouse, can place an individual higher in the order of precedence.

Determining the beginning of a term[edit]

The beginning of an appointment does not necessarily coincide with the date the Senate convenes or when the new Senator is sworn in.[citation needed] In the case of Senators first elected in a general election for the upcoming Congress, their terms begin on the first day of the new Congress. Since 1935, that means January 3 of odd-numbered years. The seniority date for an appointed senator is usually the date of the appointment, although the actual term does not begin until they take the oath of office. An incoming Senator who holds another office, including membership in the U.S. House of Representatives, must resign from that office before becoming a Senator.

Determining length of seniority[edit]

A senator's seniority is primarily determined by length of continuous service; for example, a senator who has served for 12 years is more senior than one who has served for 10 years. Because several new senators usually join at the beginning of a new Congress, seniority is determined by prior federal or state government service and, if necessary, the amount of time spent in the tiebreaking office. These tiebreakers in order are:[1]

  1. Former Senator
  2. Former Vice President
  3. Former House member
  4. Former Cabinet secretary
  5. Former state Governor
  6. Population of state based on the most recent census when the senator took office
  7. Alphabetical by last name (in case two senators came from the same state on the same day and have identical credentials)

When more than one senator has served in the same previous role, length of time in that prior office is used to break the tie. For instance, Ben Cardin, Bernie Sanders, Sherrod Brown, Bob Casey, Bob Corker, Claire McCaskill, Amy Klobuchar, Sheldon Whitehouse and Jon Tester took office on January 3, 2007, and the first three senators mentioned had previously served in the House of Representatives. Cardin, having served 20 years, is more senior than Sanders, who served 16 years, who in turn is more senior than Brown who served 14 years. Casey, Corker, McCaskill, Klobuchar, Whitehouse, and Tester rank in that order because as of the 2000 census, Pennsylvania, Tennessee, Missouri, Minnesota, Rhode Island, and Montana had populations that ranked in that order, so Tester was ranked 100th in seniority when the 110th Congress convened.

Current seniority list[edit]

Only relevant factors are listed below. For senators whose seniority is based on their state's respective population, the state population ranking is given as determined by the relevant United States Census current at the time that they first took their seat.[2][3][4][5]

   Republican R (51)        Democratic D (47)        Independent I (2)

Seniority date First tie-breaker Second tie-breaker Committee and leadership positions
1 1692 Leahy, PatrickPatrick Leahy
D – Vermont
January 3, 1975 Ranking Member: Appropriations
President pro tempore emeritus
2 1708 Hatch, OrrinOrrin Hatch
R – Utah
January 3, 1977 President pro tempore
Chair: Finance
3 1745 Grassley, ChuckChuck Grassley
R – Iowa
January 3, 1981 Chair: Judiciary
4 1766 McConnell, MitchMitch McConnell
R – Kentucky
January 3, 1985 Majority Leader
5 1775 Shelby, RichardRichard Shelby
R[n 1]Alabama
January 3, 1987 Former Representative (8 years) Chair: Appropriations
6 1777 McCain, JohnJohn McCain
R – Arizona
Former Representative (4 years) Chair: Armed Services
7 1801 Feinstein, DianneDianne Feinstein
D – California
November 4, 1992 Ranking Member: Judiciary
8 1810 Murray, PattyPatty Murray
D – Washington
January 3, 1993 Ranking Member: HELP
Assistant Minority Leader
9 1816 Inhofe, JimJim Inhofe
R – Oklahoma
November 16, 1994  
10 1827 Wyden, RonRon Wyden
D – Oregon
February 6, 1996 Ranking Member: Finance
11 1830 Roberts, PatPat Roberts
R – Kansas
January 3, 1997 Former Representative (16 years) Chair: Agriculture
12 1831 Durbin, DickDick Durbin
D – Illinois
Former Representative (14 years) Minority Whip
13 1835 Reed, JackJack Reed
D – Rhode Island
Former Representative (6 years) Ranking Member: Armed Services
14 1842 Collins, SusanSusan Collins
R – Maine
Maine 38th in population (1990) Chair: Aging
15 1843 Enzi, MikeMike Enzi
R – Wyoming
Wyoming 50th in population (1990) Chair: Budget
16 1844 Schumer, ChuckChuck Schumer
D – New York
January 3, 1999 Former Representative (18 years) Minority Leader
17 1846 Crapo, MikeMike Crapo
R – Idaho
Former Representative (6 years) Chair: Banking
18 1854 Nelson, BillBill Nelson
D – Florida
January 3, 2001 Former Representative (12 years) Ranking Member: Commerce
19 1855 Carper, TomTom Carper
D – Delaware
Former Representative (10 years) Ranking Member: Environment
20 1856 Stabenow, DebbieDebbie Stabenow
D – Michigan
Former Representative (4 years) Ranking Member: Agriculture
Democratic Policy Committee Chair
21 1859 Cantwell, MariaMaria Cantwell[n 2]
D – Washington
Former Representative (2 years) Ranking Member: Energy
22 1867 Murkowski, LisaLisa Murkowski
R – Alaska
December 20, 2002[n 3]   Chair: Energy
23 1869 Graham, LindseyLindsey Graham
R – South Carolina
January 3, 2003 Former Representative  
24 1871 Alexander, LamarLamar Alexander
R – Tennessee
Former Cabinet member Chair: HELP
25 1873 Cornyn, JohnJohn Cornyn[n 4]
R – Texas
Majority Whip
26 1876 Burr, RichardRichard Burr
R – North Carolina
January 3, 2005 Former Representative (10 years) Chair: Intelligence
27 1879 Thune, JohnJohn Thune
R – South Dakota
Former Representative (6 years) Chair: Commerce
Republican Conference Chair
28 1880 Isakson, JohnnyJohnny Isakson
R – Georgia
Former Representative (5 yrs., 10 mos.) Chair: Veterans' Affairs
Chair: Ethics
29 1885 Menendez, BobBob Menendez
D – New Jersey
January 17, 2006[n 3]   Ranking Member: Foreign Relations
30 1886 Cardin, BenBen Cardin
D – Maryland
January 3, 2007 Former Representative (20 years) Ranking Member: Small Business
31 1887 Sanders, BernieBernie Sanders
I – Vermont
Former Representative (16 years) Ranking Member: Budget
32 1888 Brown, SherrodSherrod Brown
D – Ohio
Former Representative (14 years) Ranking Member: Banking
33 1890 Casey Jr., BobBob Casey Jr.
D – Pennsylvania
Pennsylvania 6th in population (2000) Ranking Member: Aging
34 1891 Corker, BobBob Corker
R – Tennessee
Tennessee 16th in population (2000) Chair: Foreign Relations
35 1892 McCaskill, ClaireClaire McCaskill
D – Missouri
Missouri 17th in population (2000) Ranking Member: Homeland Security
36 1893 Klobuchar, AmyAmy Klobuchar
D – Minnesota
Minnesota 21st in population (2000) Ranking Member: Rules
37 1894 Whitehouse, SheldonSheldon Whitehouse
D – Rhode Island
Rhode Island 43rd in population (2000)
38 1895 Tester, JonJon Tester
D – Montana
Montana 44th in population (2000) Ranking Member: Veterans' Affairs
39 1896 Barrasso, JohnJohn Barrasso
R – Wyoming
June 22, 2007[n 3] Chair: Environment
Republican Policy Committee Chair
40 1897 Wicker, RogerRoger Wicker
R – Mississippi
December 31, 2007[n 3]
41 1899 Udall, TomTom Udall
D – New Mexico
January 3, 2009 Former Representative Vice Chair: Indian Affairs
42 1901 Shaheen, JeanneJeanne Shaheen
D – New Hampshire
Former Governor (6 years)
43 1902 Warner, MarkMark Warner
D – Virginia
Former Governor (4 years) Vice Chair: Intelligence
Democratic Caucus Vice Chair
44 1903 Risch, JimJim Risch
R – Idaho
Former Governor (7 months) Chair: Small Business
45 1905 Merkley, JeffJeff Merkley
D – Oregon
46 1909 Bennet, MichaelMichael Bennet
D – Colorado
January 21, 2009[n 3]
47 1910 Gillibrand, KirstenKirsten Gillibrand
D – New York
January 26, 2009[n 3]
48 1916 Manchin, JoeJoe Manchin
D – West Virginia
November 15, 2010 Former Governor
49 1917 Coons, ChrisChris Coons
D – Delaware
Vice Chair: Ethics
50 1919 Blunt, RoyRoy Blunt
R – Missouri
January 3, 2011 Former Representative (14 years) Missouri 17th in population (2000) Chair: Rules
Republican Conference Vice Chair
51 1920 Moran, JerryJerry Moran
R – Kansas
Kansas 33rd in population (2000)
52 1921 Portman, RobRob Portman
R – Ohio
Former Representative (12 years)
53 1922 Boozman, JohnJohn Boozman
R – Arkansas
Former Representative (10 years)
54 1923 Toomey, PatPat Toomey
R – Pennsylvania
Former Representative (6 years)
55 1924 Hoeven, JohnJohn Hoeven
R – North Dakota
Former Governor Chair: Indian Affairs
56 1925 Rubio, MarcoMarco Rubio
R – Florida
Florida 4th in population (2000)
57 1926 Johnson, RonRon Johnson
R – Wisconsin
Wisconsin 20th in population (2000) Chair: Homeland Security
58 1927 Paul, RandRand Paul
R – Kentucky
Kentucky 25th in population (2000)
59 1928 Blumenthal, RichardRichard Blumenthal
D – Connecticut
Connecticut 29th in population (2000)
60 1929 Lee, MikeMike Lee
R – Utah
Utah 34th in population (2000)
61 1931 Heller, DeanDean Heller
R – Nevada
May 9, 2011[n 3]
62 1932 Schatz, BrianBrian Schatz
D – Hawaii
December 26, 2012[n 3]
63 1933 Scott, TimTim Scott
R – South Carolina
January 2, 2013[n 3]
64 1934 Baldwin, TammyTammy Baldwin
D – Wisconsin
January 3, 2013 Former Representative (14 years) Democratic Caucus Secretary
65 1935 Flake, JeffJeff Flake
R – Arizona
Former Representative (12 years)
66 1936 Donnelly, JoeJoe Donnelly
D – Indiana
Former Representative (6 years) Indiana 15th in population (2010)
67 1937 Murphy, ChrisChris Murphy
D – Connecticut
Connecticut 29th in population (2010)
68 1938 Hirono, MazieMazie Hirono
D – Hawaii
Hawaii 40th in population (2010)
69 1939 Heinrich, MartinMartin Heinrich
D – New Mexico
Former Representative (4 years)  
70 1940 King, AngusAngus King
I – Maine
Former Governor (8 years)
71 1941 Kaine, TimTim Kaine
D – Virginia
Former Governor (4 years)
72 1942 Cruz, TedTed Cruz
R – Texas
Texas 2nd in population (2010)
73 1943 Warren, ElizabethElizabeth Warren
D – Massachusetts
Massachusetts 14th in population (2010) Democratic Caucus Vice Chair
74 1944 Fischer, DebDeb Fischer
R – Nebraska
Nebraska 38th in population (2010)
75 1945 Heitkamp, HeidiHeidi Heitkamp
D – North Dakota
North Dakota 48th in population (2010)
76 1948 Markey, EdEd Markey
D – Massachusetts
July 16, 2013
77 1949 Booker, CoryCory Booker
D – New Jersey
October 31, 2013
78 1951 Capito, Shelley MooreShelley Moore Capito
R – West Virginia
January 3, 2015 Former Representative (14 years)
79 1952 Peters, GaryGary Peters
D – Michigan
Former Representative (6 years) Michigan 8th in population (2010)
80 1953 Cassidy, BillBill Cassidy[n 5]
R – Louisiana
Louisiana 25th in population (2010)
81 1954 Gardner, CoryCory Gardner
R – Colorado
Former Representative (4 years) Colorado 22nd in population (2010) NRSC Chair
82 1955 Lankford, JamesJames Lankford
R – Oklahoma
Oklahoma 28th in population (2010)
83 1956 Cotton, TomTom Cotton
R – Arkansas
Former Representative (2 years) Arkansas 32nd in population (2010)
84 1957 Daines, SteveSteve Daines
R – Montana
Montana 44th in population (2010)
85 1958 Rounds, MikeMike Rounds
R – South Dakota
Former Governor
86 1959 Perdue, DavidDavid Perdue
R – Georgia
Georgia 9th in population (2010)
87 1960 Tillis, ThomThom Tillis
R – North Carolina
North Carolina 10th in population (2010)
88 1961 Ernst, JoniJoni Ernst
R – Iowa
Iowa 30th in population (2010)
89 1962 Sasse, BenBen Sasse
R – Nebraska
Nebraska 38th in population (2010)
90 1963 Sullivan, DanDan Sullivan
R – Alaska
Alaska 47th in population (2010)
91 1964 Van Hollen, ChrisChris Van Hollen
D – Maryland
January 3, 2017 Former Representative (14 years) DSCC Chair
92 1965 Young, ToddTodd Young
R – Indiana
Former Representative (6 years)
93 1966 Duckworth, TammyTammy Duckworth
D – Illinois
Former Representative (4 years)
94 1967 Hassan, MaggieMaggie Hassan
D – New Hampshire
Former Governor
95 1968 Harris, KamalaKamala Harris
D – California
California 1st in population (2010)
96 1969 Kennedy, John NeelyJohn Neely Kennedy
R – Louisiana
Louisiana 25th in population (2010)
97 1970 Cortez Masto, CatherineCatherine Cortez Masto
D – Nevada
Nevada 35th in population (2010)
98 1972 Smith, TinaTina Smith
D – Minnesota
January 3, 2018 Minnesota 21st in population (2010)
99 1973 Jones, DougDoug Jones
D – Alabama
Alabama 23rd in population (2010)
100 1974 Hyde-Smith, CindyCindy Hyde-Smith
R – Mississippi
April 2, 2018[n 3]
Rank Historical
Seniority date First tie-breaker Second tie-breaker Committee and leadership positions

See also[edit]


  1. ^ Richard Shelby's 1994 party change did not break his service or seniority.
  2. ^ Maria Cantwell (#21) is the Senate's most senior junior senator.
  3. ^ a b c d e f g h i j The seniority date for an appointed senator is the date of the appointment, not necessarily the date of taking the oath of office. See Determining the beginning of a term, above.
  4. ^ John Cornyn's predecessor, Phil Gramm, resigned early, effective November 30, 2002, so that Senator-elect Cornyn could take office early, and move into Gramm's office suite in order to begin organizing his staff. Cornyn did not, however, gain seniority, owing to a 1980 Rules Committee policy that no longer gave seniority to senators who entered Congress early for the purpose of gaining advantageous office space.
  5. ^ Bill Cassidy (#80) is the Senate's most junior senior senator.


  1. ^ a b "Senators of the United States 1789–present, A chronological list of senators since the First Congress in 1789" (PDF). Senate Historical Office. April 17, 2015. Retrieved August 8, 2015. 
  2. ^ "1981 U.S Census Report" (PDF). 
  3. ^ "1991 U.S Census Report" (PDF). 
  4. ^ American FactFinder, United States Census Bureau. "2000 Census State Population Rankings". Retrieved May 28, 2010. 
  5. ^ "Resident Population Data (Text Version) – 2010 Census, by state and census region". 
  6. ^ "Historical rank" refers to the Senator's seniority over the entire history of the Senate since 1789. This is an absolute number that does not change from one Congress to the next.


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