# List of United States senators in the 89th Congress

This is a complete list of members of the United States Senate during the 89th United States Congress listed by seniority, from January 3, 1965, to January 3, 1967.
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, J. William Fulbright (D-Arkansas) was the most senior junior senator and Daniel Brewster (D-Maryland) was the most junior senior senator for most of the congress until A. Willis Robertson retired from the senate when Harry F. Byrd Jr. (D-Virginia) took this distinction in the final days of the congress.
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 1966 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 2 | Terms of service of senators that expired in 1967 (AK, 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.) |
| Class 3 | Terms of service of senators that expired in 1969 (AK, AL, AR, AZ, CA, CO, CT, DE, FL, GA, HI, IA, ID, IL, IN, KS, KY, LA, MA, ME, MI, MN, MS, NC, ND, NH, NM, NV, NY, OK, OR, SC, SD, TN, TX, VA, WA, WV, and WY.) |
| Class 1 | Terms of service of senators that expired in 1971 (AZ, CA, CT, DE, FL, HI, 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.) |

## U.S. Senate seniority list

U.S. Senate seniority :
| Rank | Historical rank | Senator (party-state) | Seniority date | Other factors |
| 1 | 1248 | Carl Hayden (D-AZ) | March 4, 1927 | |
| 2 | 1306 | Richard Russell, Jr. (D-GA) | January 12, 1933 | |
| 3 | 1311 | Harry F. Byrd, Sr. (D-VA) | March 4, 1933 | |
| 4 | 1352 | Allen J. Ellender (D-LA) | January 3, 1937 | |
| 5 | 1365 | Joseph L. Hill (D-AL) | January 11, 1938 | |
| 6 | 1399 | George Aiken (R-VT) | January 10, 1941 | |
| 7 | 1403 | James Eastland (D-MS) | January 3, 1943 | Previously a senator |
| 8 | 1417 | John Little McClellan (D-AR) | January 3, 1943 | |
| 9 | 1430 | Warren G. Magnuson (D-WA) | December 14, 1944 | |
| 10 | 1432 | J. William Fulbright (D-AR) | January 3, 1945 | Former representative |
| 11 | 1433 | Bourke B. Hickenlooper (R-IA) | January 3, 1945 | Former governor, Iowa 20th in population (1940) |
| 12 | 1435 | Olin D. Johnston (D-SC) | January 3, 1945 | Former governor, South Carolina 26th in population (1940) |
| 13 | 1437 | Wayne Morse (D-OR) | January 3, 1945 | |
| 14 | 1441 | Leverett Saltonstall (R-MA) | January 4, 1945 | |
| 15 | 1446 | Milton Young (R-ND) | March 12, 1945 | |
| 16 | 1454 | Spessard Holland (D-FL) | September 24, 1946 | |
| 17 | 1458 | A. Willis Robertson (D-VA) | November 6, 1946 | Former representative (13 years, 10 months) |
| 18 | 1459 | John Sparkman (D-AL) | November 6, 1946 | Former representative (9 years, 10 months) |
| 19 | 1475 | John J. Williams (R-DE) | January 3, 1947 | |
| 20 | 1476 | John C. Stennis (D-MS) | November 17, 1947 | |
| 21 | 1480 | Karl Mundt (R-SD) | December 31, 1948 | Former representative |
| 22 | 1481 | Russell B. Long (D-LA) | December 31, 1948 |
| 23 | 1485 | Margaret Chase Smith (R-ME) | January 3, 1949 | Former representative (8 years, 7 months) |
| 24 | 1486 | Clinton Anderson (D-NM) | January 3, 1949 | Former representative (4 years, 5 months) |
| 25 | 1490 | Paul Douglas (D-IL) | January 3, 1949 | |
| 26 | 1504 | Frank Carlson (R-KS) | November 27, 1950 | |
| 27 | 1506 | John O. Pastore (D-RI) | December 19, 1950 | |
| 28 | 1507 | Everett Dirksen (R-IL) | January 3, 1951 | Former representative (16 years) |
| 29 | 1509 | Almer Monroney (D-OK) | January 3, 1951 | Former representative (12 years) |
| 30 | 1511 | George Smathers (D-FL) | January 3, 1951 | Former representative (4 years) |
| 31 | 1513 | Wallace F. Bennett (R-UT) | January 3, 1951 | |
| 32 | 1523 | Thomas Kuchel (R-CA) | January 2, 1953 | |
| 33 | 1524 | Albert Gore, Sr. (D-TN) | January 3, 1953 | Former representative (14 years) |
| 34 | 1525 | Henry M. Jackson (D-WA) | January 3, 1953 | Former representative (12 years) |
| 35 | 1528 | Mike Mansfield (D-MT) | January 3, 1953 | Former representative (10 years) |
| 36 | 1533 | Stuart Symington (D-MO) | January 3, 1953 | |
| 37 | 1538 | Sam Ervin (D-NC) | June 5, 1954 | |
| 38 | 1544 | Norris Cotton (R-NH) | November 8, 1954 | Former representative (7 years, 10 months) |
| 39 | 1545 | Roman Hruska (R-NE) | November 8, 1954 | Former representative (1 year, 10 months) |
| 40 | 1547 | Alan Bible (D-NV) | December 2, 1954 | |
| 41 | 1550 | Carl Curtis (R-NE) | January 1, 1955 | |
| 42 | 1551 | Clifford P. Case (R-NJ) | January 3, 1955 | Former representative |
| 43 | 1553 | Patrick V. McNamara (D-MI) | January 3, 1955 | Maryland 24th in population (1950) |
| 44 | 1555 | Gordon L. Allott (R-CO) | January 3, 1955 | Colorado 32nd in population (1950) |
| 45 | 1456 | John Sherman Cooper (R-KY) | November 7, 1956 | Previously a senator (twice) (total tenure 4 years, 4 months) |
| 46 | 1549 | Strom Thurmond (R-SC) | November 7, 1956 | Previously a senator (1 year, 3 months) |
| 47 | 1559 | Thruston Ballard Morton (R-KY) | January 3, 1957 | Former representative |
| 48 | 1561 | Frank J. Lausche (D-OH) | January 3, 1957 | Former governor, Ohio 5th in population (1950) |
| 49 | 1562 | Herman Talmadge (D-GA) | January 3, 1957 | Former governor, Georgia 13th in population (1950) |
| 50 | 1563 | Joseph S. Clark (D-PA) | January 3, 1957 | Pennsylvania 3rd in population (1950) |
| 51 | 1564 | Frank Church (D-ID) | January 3, 1957 | Idaho 43rd in population (1950) |
| 52 | 1565 | Jacob K. Javits (R-NY) | January 9, 1957 | |
| 53 | 1567 | Ralph Yarborough (D-TX) | April 29, 1957 | |
| 54 | 1568 | William Proxmire (D-WI) | August 28, 1957 | |
| 55 | 1570 | Ben Jordan (D-NC) | April 19, 1958 | |
| 56 | 1571 | Jennings Randolph (D-WV) | November 5, 1958 | |
| 57 | 1572 | Hugh Scott (R-PA) | January 3, 1959 | Former representative (18 years) |
| 58 | 1575 | Eugene McCarthy (D-MN) | January 3, 1959 | Former representative (10 years) |
| 59 | 1576 | Stephen Young (D-OH) | January 3, 1959 | Former representative (8 years), Ohio 5th in population (1950) |
| 60 | 1577 | Winston L. Prouty (R-VT) | January 3, 1959 | Former representative (8 years), Vermont 46th in population (1950) |
| 61 | 1578 | Robert Byrd (D-WV) | January 3, 1959 | Former representative (6 years) |
| 62 | 1579 | Harrison A. Williams (D-NJ) | January 3, 1959 | Former representative (4 years), New Jersey 8th in population (1950) |
| 63 | 1580 | Thomas J. Dodd (D-CT) | January 3, 1959 | Former representative (4 years), Connecticut 34th in population (1950) |
| 64 | 1581 | Edward L. Bartlett (D-AK) | January 3, 1959 | Former delegate |
| 65 | 1582 | Edmund Muskie (D-ME) | January 3, 1959 | Former governor, Maine 35th in population (1950) |
| 66 | 1583 | Ernest Gruening (D-AK) | January 3, 1959 | Former Territorial Governor, Alaska 50th in population (1950) |
| 67 | 1584 | Philip Hart (D-MI) | January 3, 1959 | Michigan 7th in population (1950) |
| 68 | 1585 | Vance Hartke (D-IN) | January 3, 1959 | Indiana 11th in population (1950) |
| 69 | 1586 | Frank Moss (D-UT) | January 3, 1959 | Utah 38th in population (1950) |
| 70 | 1587 | Gale W. McGee (D-WY) | January 3, 1959 | Wyoming 48th in population (1950) |
| 71 | 1588 | Howard Cannon (D-NV) | January 3, 1959 | Nevada 49th in population (1950) |
| 72 | 1590 | Hiram Fong (R-HI) | August 21, 1959 | |
| 73 | 1593 | Quentin Northrup Burdick (D-ND) | August 8, 1960 | |
| 74 | 1594 | Edward V. Long (D-MO) | September 23, 1960 | |
| 75 | 1595 | Maurine Neuberger (D-OR) | November 9, 1960 | |
| 76 | 1597 | Lee Metcalf (D-MT) | January 3, 1961 | Former representative (8 years) |
| 77 | 1598 | James Boggs (R-DE) | January 3, 1961 | Former representative (6 years) |
| 78 | 1600 | Jack Miller (R-IA) | January 3, 1961 | Iowa 22nd in population (1950) |
| 79 | 1601 | Claiborne Pell (D-RI) | January 3, 1961 | Rhode Island 36th in population (1950) |
| 80 | 1602 | John Tower (R-TX) | June 15, 1961 | |
| 81 | 1604 | James B. Pearson (R-KS) | January 31, 1962 | |
| 82 | 1606 | Leonard B. Jordan (R-ID) | August 6, 1962 | |
| 83 | 1607 | Milward L. Simpson (R-WY) | November 7, 1962 | Former governor |
| 84 | 1608 | Ted Kennedy (D-MA) | November 7, 1962 | Massachusetts 9th in population (1960) |
| 85 | 1609 | Thomas J. McIntyre (D-NH) | November 7, 1962 | New Hampshire 45th in population (1960) |
| 86 | 1611 | Abraham A. Ribicoff (D-CT) | January 3, 1963 | Former representative (4 years), former cabinet secretary |
| 87 | 1612 | Daniel Brewster (D-MD) | January 3, 1963 | Former representative (4 years) - Maryland 21st in population (1960) |
| 88 | 1613 | George McGovern (D-SD) | January 3, 1963 | Former representative (4 years) - South Dakota 40th in population (1960) |
| 89 | 1614 | Daniel Inouye (D-HI) | January 3, 1963 | Former representative (4 years) - Hawaii 43rd in population (1960) |
| 90 | 1615 | Peter H. Dominick (R-CO) | January 3, 1963 | Former representative (2 years) |
| 91 | 1616 | Birch Bayh (D-IN) | January 3, 1963 | |
| 92 | 1618 | Gaylord Nelson (D-WI) | January 7, 1963 | |
| 93 | 1621 | Ross Bass (D-TN) | November 4, 1964 | Former representative (9 years, 10 months) |
| 94 | 1622 | Joseph Montoya (D-NM) | November 4, 1964 | Former representative (7 years) |
| 95 | 1623 | Fred R. Harris (D-OK) | November 4, 1964 | |
| 96 | 1624 | Walter Mondale (D-MN) | December 30, 1964 | |
| 97 | 1625 | George Murphy (R-CA) | January 1, 1965 | |
| 98 | 1626 | Joseph Tydings (D-MD) | January 3, 1965 | Former representative |
| 99 | 1627 | Robert F. Kennedy (D-NY) | January 3, 1965 | Former cabinet member |
| 100 | 1628 | Paul Fannin (R-AZ) | January 3, 1965 | |
| | 1629 | Donald S. Russell (D-SC) | April 22, 1965 | |
| | 1630 | Harry F. Byrd, Jr. (D-VA) | November 12, 1965 | |
| | 1631 | Robert P. Griffin (R-MI) | May 11, 1966 | |
| | 1632 | Ernest Hollings (D-SC) | November 9, 1966 | |
| | 1633 | William B. Spong, Jr. (D-VA) | December 31, 1966 | |
The senior senators by class were Harry F. Byrd Sr. (D-Virginia) from Class 1, Richard Russell Jr. (D-Georgia) from Class 2, and Carl Hayden (D-Arizona) from Class 3. Byrd Sr. resigned on November 10, 1965 with Spessard Holland (D-Florida) became the most senior senator from his class.