# List of United States senators in the 84th Congress

This is a complete list of members of the United States Senate during the 84th United States Congress listed by seniority, from January 3, 1955, to January 3, 1957.
Order of service is based on the commencement of the senator's first term. Behind this is former service as a senator (only giving the senator seniority within his or her new incoming class), service as vice president, a House member, a cabinet secretary, or a governor of a state. The final factor is the population of the senator's state.
In this congress, Richard Russell, Jr. (D-Georgia) was the most senior junior senator and Roman Hruska (R-Nebraska) was the most junior senior senator.
Senators who were sworn in during the middle of the two-year congressional term (up until the last senator who was not sworn in early after winning the November 1956 election) are listed at the end of the list with no number.

## Terms of service

| Class | Terms of service of senators that expired in years |
| Class 3 | Terms of service of senators that expired in 1957 (AL, AR, AZ, CA, CO, CT, FL, GA, ID, IL, IN, IA, KS, KY, LA, MD, MO, NC, ND, NH, NV, NY, OH, OK, OR, PA, SC, SD, UT, VT, WA, and WI.) |
| Class 1 | Terms of service of senators that expired in 1959 (AZ, CA, CT, DE, FL, IN, MA, MD, ME, MI, MN, MO, MS, MT, ND, NE, NJ, NM, NV, NY, OH, PA, RI, TN, TX, UT, VA, VT, WA, WI, WV, and WY.) |
| Class 2 | Terms of service of senators that expired in 1961 (AL, AR, CO, DE, GA, IA, ID, IL, KS, KY, LA, MA, ME, MI, MN, MS, MT, NC, NE, NH, NJ, NM, OK, OR, RI, SC, SD, TN, TX, VA, WV, and WY.) |

## U.S. Senate seniority list

U.S. Senate seniority :
| Rank | Senator (party-state) | Seniority date | Other factors |
| 1 | Walter F. George (D-GA) | November 22, 1922 | |
| 2 | Carl Hayden (D-AZ) | March 4, 1927 | |
| 3 | Richard Russell, Jr. (D-GA) | January 12, 1933 | |
| 4 | Harry F. Byrd, Sr. (D-VA) | March 4, 1933 | |
| 5 | James Murray (D-MT) | November 7, 1934 | |
| 6 | Dennis Chavez (D-NM) | May 11, 1935 | |
| 7 | Theodore F. Green (D-RI) | January 3, 1937 | Former Governor, Rhode Island 37th in population (1930) |
| 8 | Styles Bridges (R-NH) | January 3, 1937 | Former Governor, New Hampshire 41st in population (1930) |
| 9 | Allen J. Ellender (D-LA) | January 3, 1937 | |
| 10 | Joseph L. Hill (D-AL) | January 11, 1938 | |
| 11 | Alexander Wiley (R-WI) | January 3, 1939 | |
| 12 | William Langer (R-ND) | January 3, 1941 | Former Governor |
| 13 | Harley M. Kilgore (D-WV) | January 3, 1941 | |
| 14 | George Aiken (R-VT) | January 10, 1941 | |
| 15 | Eugene D. Millikin (R-CO) | December 20, 1941 | |
| 16 | James Eastland (D-MS) | January 3, 1943 | Previously a Senator |
| 17 | John Little McClellan (D-AR) | January 3, 1943 | |
| 18 | Howard A. Smith (R-NJ) | December 7, 1944 | |
| 19 | Warren G. Magnuson (D-WA) | December 14, 1944 | |
| 20 | J. William Fulbright (D-AR) | January 3, 1945 | Former Representative |
| 21 | Bourke B. Hickenlooper (R-IA) | January 3, 1945 | Former Governor, Iowa 20th in population (1940) |
| 22 | Olin D. Johnston (D-SC) | January 3, 1945 | Former Governor, South Carolina 26th in population (1940) |
| 23 | Homer E. Capehart (R-IN) | January 3, 1945 | Indiana 12th in population (1940) |
| 24 | Wayne Morse (D-OR) | January 3, 1945 | Oregon 34th in population (1940) |
| 25 | Leverett Saltonstall (R-MA) | January 4, 1945 | |
| 26 | Milton Young (R-ND) | March 12, 1945 | |
| 27 | William F. Knowland (R-CA) | August 26, 1945 | |
| 28 | Spessard Holland (D-FL) | September 25, 1946 | |
| 29 | Ralph Flanders (R-VT) | November 1, 1946 | |
| 30 | A. Willis Robertson (D-VA) | November 6, 1946 | Former Representative (13 years and 10 months) |
| 31 | John Sparkman (D-AL) | November 6, 1946 | Former Representative (9 years and 10 months) |
| 32 | William E. Jenner (R-IN) | January 3, 1947 | Previously a senator |
| 33 | Edward Martin (R-PA) | January 3, 1947 | Former Governor, Pennsylvania 2nd in population (1940) |
| 34 | John W. Bricker (R-OH) | January 3, 1947 | Former Governor, Ohio 4th in population (1940) |
| 35 | Edward John Thye (R-MN) | January 3, 1947 | Former Governor, Minnesota 18th in population (1940) |
| 36 | Irving Ives (R-NY) | January 3, 1947 | New York 1st in population (1940) |
| 37 | Joseph McCarthy (R-WI) | January 3, 1947 | Wisconsin 13th in population (1940) |
| 38 | Arthur Vivian Watkins (R-UT) | January 3, 1947 | Utah 40th in population (1940) |
| 39 | John J. Williams (R-DE) | January 3, 1947 | 47th in population (1940) |
| 40 | George W. Malone (R-NV) | January 3, 1947 | Nevada 48th in population (1940) |
| 41 | John C. Stennis (D-MS) | November 17, 1947 | |
| 42 | Karl Mundt (R-SD) | December 31, 1948 | Former Representative |
| 43 | Russell B. Long (D-LA) | December 31, 1948 | |
| 44 | Matthew M. Neely (D-WV) | January 3, 1949 | Previously a senator |
| 45 | Lyndon Johnson (D-TX) | January 3, 1949 | Former Representative (12 years) |
| 46 | Estes Kefauver (D-TN) | January 3, 1949 | Former Representative (10 years) |
| 47 | Margaret Chase Smith (R-ME) | January 3, 1949 | Former Representative (8 years and 7 months) |
| 48 | Clinton Anderson (D-NM) | January 3, 1949 | Former Representative (4 years) |
| 49 | Robert S. Kerr (D-OK) | January 3, 1949 | Former Governor, Oklahoma 22nd in population (1940) |
| 50 | Andrew F. Schoeppel (R-KS) | January 3, 1949 | Former Governor, Kansas 29th in population (1940) |
| 51 | Paul Douglas (D-IL) | January 3, 1949 | Illinois 3rd in population (1940) |
| 52 | Hubert Humphrey (D-MN) | January 3, 1949 | Minnesota 18th in population (1940) |
| 53 | Joseph Frear, Jr. (D-DE) | January 3, 1949 | Delaware 47th in population (1940) |
| 54 | Henry Dworshak (R-ID) | October 14, 1949 | |
| 55 | Herbert H. Lehman (D-NY) | November 9, 1949 | |
| 56 | Frank Carlson (R-KS) | November 27, 1950 | Former Representative (12 years) |
| 57 | Earle C. Clements (D-KY) | November 27, 1950 | Former Representative (3 years) |
| 58 | John O. Pastore (D-RI) | December 19, 1950 | |
| 59 | Everett Dirksen (R-IL) | January 3, 1951 | Former Representative (16 years) |
| 60 | Francis H. Case (R-SD) | January 3, 1951 | Former Representative (14 years) |
| 61 | Almer Monroney (D-OK) | January 3, 1951 | Former Representative (12 years) |
| 62 | Thomas C. Hennings, Jr. (D-MO) | January 3, 1951 | Former Representative (6 years) |
| 63 | George Smathers (D-FL) | January 3, 1951 | Former Representative (4 years) |
| 64 | John M. Butler (R-MD) | January 3, 1951 | Maryland 28th in population (1940) |
| 65 | Wallace F. Bennett (R-UT) | January 3, 1951 | Utah 40th in population (1940) |
| 66 | Herman Welker (R-ID) | January 3, 1951 | Idaho 43rd in population (1940) |
| 67 | James H. Duff (R-PA) | January 16, 1951 | |
| 68 | Charles E. Potter (R-MI) | November 5, 1952 | Former Representative |
| 69 | Prescott Bush (R-CT) | November 5, 1952 | |
| 70 | Thomas Kuchel (R-CA) | January 2, 1953 | |
| 71 | William A. Purtell (R-CT) | January 3, 1953 | Previously a senator |
| 72 | Albert Gore, Sr. (D-TN) | January 3, 1953 | Former Representative (14 years) |
| 73 | Henry M. Jackson (D-WA) | January 3, 1953 | Former Representative (12 years) |
| 74 | James Glenn Beall (R-MD) | January 3, 1953 | Former Representative (10 years), Maryland 24th in population (1950) |
| 75 | Mike Mansfield (D-MT) | January 3, 1953 | Former Representative (10 years), Montana 42nd in population (1950) |
| 76 | John F. Kennedy (D-MA) | January 3, 1953 | Former Representative (6 years) |
| 77 | Frederick G. Payne (R-ME) | January 3, 1953 | Former Governor, Maine 35th in population (1950) |
| 78 | Frank A. Barrett (R-WY) | January 3, 1953 | Former Governor, Wyoming 48th in population (1950) |
| 79 | Price Daniel (D-TX) | January 3, 1953 | Texas 6th in population (1950) |
| 80 | Stuart Symington (D-MO) | January 3, 1953 | Missouri 12th in population (1950) |
| 81 | Barry Goldwater (R-AZ) | January 3, 1953 | Arizona 37th in population (1950) |
| 82 | Sam Ervin (D-NC) | June 5, 1954 | |
| 83 | Norris Cotton (R-NH) | November 8, 1954 | Former Representative (7 years and 10 months) |
| 84 | Roman Hruska (R-NE) | November 8, 1954 | Former Representative (1 year and 10 months) |
| 85 | Joseph C. O'Mahoney (D-WY) | November 29, 1954 | Previously a senator |
| 86 | W. Kerr Scott (D-NC) | November 29, 1954 | |
| 87 | Alan Bible (D-NV) | December 2, 1954 | |
| 88 | George H. Bender (R-OH) | December 16, 1954 | |
| 89 | Strom Thurmond (I-SC) | December 24, 1954 | |
| 90 | Carl Curtis (R-NE) | January 1, 1955 | |
| 91 | Alben W. Barkley (D-KY) | January 3, 1955 | Previously a senator |
| 92 | Clifford P. Case (R-NJ) | January 3, 1955 | Former Representative (8 years) |
| 93 | Thomas Martin (R-IA) | January 3, 1955 | Former Representative (6 years) |
| 94 | Patrick V. McNamara (D-MI) | January 3, 1955 | Maryland 24th in population (1950) |
| 95 | Richard L. Neuberger (D-OR) | January 3, 1955 | Oregon 31st in population (1950) |
| 96 | Gordon L. Allott (R-CO) | January 3, 1955 | Colorado 32nd in population (1950) |
| | William R. Laird, III (D-WV) | March 13, 1956 | |
| | Thomas A. Wofford (D-SC) | April 5, 1956 | |
| | Robert Humphreys (R-KY) | June 21, 1956 | |
| | W. Chapman Revercomb (R-WV) | November 7, 1956 | Previously a senator (6 years) |
| | John Sherman Cooper (R-KY) | November 7, 1956 | Previously a senator (twice) (total tenure 4 years and 4 months) |
| | Strom Thurmond (D-SC) | November 7, 1956 | Previously a senator (1 year and 3 months) |
The most senior senators by class were Harry F. Byrd Sr. (D-Virginia) from Class 1, Richard Russell Jr. (D-Georgia) from Class 2, and Walter F. George (D-Georgia) from Class 3. Russell was the most senior senator from his class being the junior senator from his state.