This is a classification of United States Senators by seniority during the 93rd Congress, from January 3, 1973 to January 3, 1975.
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.
Senators who were sworn in in the middle of the two-year congressional term (up until the last senator who was not sworn in early after winning the November 1974 election) are listed at the end of the list with no number.
| Rank | Name | Seniority Date | Other Factors |
|---|---|---|---|
| 1 | George Aiken (R-VT) | January 10, 1941 | |
| 2 | James Eastland (D-MS) | January 3, 1943 | Previously A Senator |
| 3 | John Little McClellan (D-AR) | ||
| 4 | Warren G. Magnuson (D-WA) | December 14, 1944 | |
| 5 | J. William Fulbright (D-AR) | January 3, 1945 | |
| 6 | Milton Young (R-ND) | March 12, 1945 | |
| 7 | John Sparkman (D-AL) | November 6, 1946 | |
| 8 | John C. Stennis (D-MS) | November 17, 1947 | |
| 9 | Russell B. Long (D-LA) | December 31, 1948 | |
| 10 | John O. Pastore (D-RI) | December 19, 1950 | |
| 11 | Wallace F. Bennett (R-UT) | January 3, 1951 | |
| 12 | Henry M. Jackson (D-WA) | January 3, 1953 | Former Rep (12 Years) |
| 13 | Mike Mansfield (D-MT) | Former Rep (10 Years) | |
| 14 | Stuart Symington (D-MO) | ||
| 15 | Sam Ervin (D-NC) | June 5, 1954 | |
| 16 | Norris Cotton (R-NH) | November 8, 1954 | Former Rep (7 Years, 10 Months) |
| 17 | Roman Hruska (R-NE) | Former Rep (1 Year, 10 Months) | |
| 18 | Alan Bible (D-NV) | December 2, 1954 | |
| 19 | Carl Curtis (R-NE) | January 1, 1955 | |
| 20 | Clifford P. Case (R-NJ) | January 3, 1955 | |
| 21 | Strom Thurmond (R-SC) | November 7, 1956 | |
| 22 | Herman Talmadge (D-GA) | January 3, 1957 | Former Governor |
| 23 | Frank Church (D-ID) | ||
| 24 | Jacob K. Javits (R-NY) | January 9, 1957 | |
| 25 | William Proxmire (D-WI) | August 28, 1957 | |
| 26 | Jennings Randolph (D-WV) | November 5, 1958 | |
| 27 | Hugh Scott (D_PA) | January 3, 1959 | Former Rep (18 Years) |
| 28 | Robert Byrd (D-WV) | Former Rep (6 years) | |
| 29 | Harrison A. Williams (D-NJ) | Former Rep (4 years) | |
| 30 | Edmund Muskie (D-ME) | Former Governor | |
| 31 | Philip Hart (D-MI) | Michigan 7th Population (1950) | |
| 32 | Vance Hartke (D-IN) | Indiana 11th Population (1950) | |
| 33 | Frank Moss (D-UT) | Utah 38th Population (1950) | |
| 34 | Gale W. McGee (D-WY) | Wyoming 48th Population (1950) | |
| 35 | Howard Cannon (D-NV) | Nevada 49th Population (1950) | |
| 36 | Hiram Fong (R-HI) | August 21, 1959 | |
| 37 | Quentin Northrup Burdick (D-ND) | August 8, 1960 | |
| 38 | Lee Metcalf (D-MT) | January 3, 1961 | Former Rep (8 years) |
| 39 | Claiborne Pell (D-RI) | ||
| 40 | John Tower (R-TX) | June 15, 1961 | |
| 41 | James B. Pearson (R-KS) | January 31, 1962 | |
| 42 | Ted Kennedy (D-MA) | November 7, 1962 | Massachusetts 9th Population (1960) |
| 43 | Thomas J. McIntyre (D-NH) | New Hampshire 45th Population (1960) | |
| 44 | Abraham A. Ribicoff (D-CT) | January 3, 1963 | Former Rep (14 Years), Former Cabinet Secretary, Former Governor |
| 45 | George McGovern (D-SD) | Former Rep (14 Years) | |
| 46 | Daniel Inouye (D-HI) | Former Rep (4 Years) | |
| 47 | Peter H. Dominick (R-CO) | Former Rep (2 Years) | |
| 48 | Birch Bayh (D-IN) | ||
| 49 | Gaylord Nelson (D-WI) | January 7, 1963 | |
| 50 | Joseph Montoya (D-NM) | November 4, 1964 | |
| 51 | Walter Mondale (D-MN) | December 30, 1964 | |
| 52 | Paul Fannin (R-AZ) | January 3, 1965 | |
| 53 | Harry F. Byrd, Jr. (I-VA) | November 12, 1965 | |
| 54 | Robert P. Griffin (R-MI) | May 11, 1966 | |
| 55 | Ernest Hollings (D-SC) | November 9, 1966 | |
| 56 | Clifford Hansen (R-WY) | January 3, 1967 | Former Governor |
| 57 | Charles H. Percy (R-IL) | Illinois 4th Population (1960) | |
| 58 | Edward Brooke (R-MA) | Massachusetts 9th Population (1960) | |
| 59 | Howard Baker (R-TN) | Tennessee 17th Population (1960) | |
| 60 | Mark Hatfield (R-OR) | January 10, 1967 | |
| 61 | Marlow Cook (R-KY) | December 17, 1968 | |
| 62 | Ted Stevens (R-AK) | December 24, 1968 | |
| 63 | Thomas Eagleton (D-MO) | December 28, 1968 | |
| 64 | Barry Goldwater (R-AZ) | January 3, 1969 | Previously A Senator |
| 65 | Richard Schweiker (R-PA) | Former Rep (8 years) - Pennsylvania 3rd Population (1960) | |
| 66 | Charles Mathias (R-MD) | Former Rep (8 years) - Maryland 21st Population (1960) | |
| 67 | Bob Dole (R-KS) | Former Rep (8 years) - Kansas 29th Population (1960) | |
| 68 | Edward J. Gurney (R-FL) | Former Rep (6 Years) | |
| 69 | Harold Hughes (D-IA) | Former Governor, Iowa 24th Population (1960) | |
| 70 | Henry Bellmon (R-OK) | Former Governor, Oklahoma 27th Population (1960) | |
| 71 | Alan Cranston (D-CA) | California 2nd Population (1960) | |
| 72 | William B. Saxbe (R-OH) | Ohio 5th Population (1960) | |
| 73 | James Allen (D-AL) | Alabama 19th Population (1960) | |
| 74 | Bob Packwood (R-OR) | Oregon 32nd Population (1960) | |
| 75 | Mike Gravel (D-AK) | Alaska 50th Population (1969) | |
| 76 | Adlai Stevenson III (D-IL) | November 17, 1970 | |
| 77 | Bill Roth (R-DE) | January 1, 1971 | |
| 78 | John V. Tunney (D-CA) | January 2, 1971 | |
| 79 | Hubert Humphrey (D-MN) | January 3, 1971 | Previously a Senator, Former VP |
| 80 | Robert Taft, Jr. (R-OH) | Former Rep (8 Years) - Ohio 5th Population (1960) | |
| 81 | Bill Brock (R-TN) | Former Rep (8 Years) - Tennessee 17th Population (1960) | |
| 82 | Lloyd Bentsen (D-TX) | Former Rep (6 Years) | |
| 83 | John Glenn Beall, Jr. (R-MD) | Former Rep (2 Years) - Maryland 21st Population (1970) | |
| 84 | Lowell Weicker (R-CT) | Former Rep (2 Years) - Connecticut 25th Population (1960) | |
| 85 | James L. Buckley (C/R-NY) | New York 1st Population (1960) | |
| 86 | Lawton Chiles (D-FL) | Florida 10th Population (1960) | |
| 87 | Robert Stafford (R-VT) | September 16, 1971 | |
| 88 | Sam Nunn (D-GA) | November 8, 1972 | |
| 89 | Bennett Johnston Jr. (D-LA) | November 14, 1972 | |
| 90 | William Hathaway (D-ME) | January 3, 1973 | Former Rep (8 Years) |
| 91 | William L. Scott (R-VA) | Former Rep (6 Years) | |
| 92 | James A. McClure (R-ID) | Former Rep (4 Years) | |
| 93 | James Abourezk (D-SD) | Former Rep (2 Years) | |
| 94 | Dewey F. Bartlett (R-OK) | Former Governor | |
| 95 | Jesse Helms (R-NC) | North Carolina 12th Population (1970) | |
| 96 | Walter Huddleston (D-KY) | Kentucky 23rd Population (1970) | |
| 97 | Richard C. Clark (D-IA) | Iowa 25th Population (1970) | |
| 98 | Floyd K. Haskell (D-CO) | Colorado 30th Population (1970) | |
| 99 | Pete Domenici (R-NM) | New Mexico 37th Population (1970) | |
| 100 | Joe Biden (D-DE) | Delaware 46th Population (1970) | |
| Howard Metzenbaum (D-OH) | January 3, 1974 |
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