| CONGRESS | NAME OF SENATOR | TERM BEGAN | TERM ENDED | COMMENTS |
|---|---|---|---|---|
| Class 1 | ||||
| 51st - 52nd | John B. Allen (R) | Nov. 20, 1889 | Mar. 3, 18931 | |
| 53rd - 55th | John L. Wilson (R) | Feb. 19, 1895 | Mar. 3, 1899 | |
| 56th - 58th | Addison G. Foster (R) | Mar. 4, 1899 | Mar. 3, 1905 | |
| 59th - 61st | Samuel H. Piles (R) | Mar. 4, 1905 | Mar. 3, 1911 | |
| 62nd - 67th | Miles Poindexter (R, PR, R) | Mar. 4, 1911 | Mar. 3, 1923 | |
| 68th - 73rd | Clarence C. Dill (D) | Mar. 4, 1923 | Jan. 3, 1935 | |
| 74th - 76th | Lewis B. Schwellenbach (D) | Jan. 3, 1935 | Dec. 16, 1940 | Resigned |
| 76th - 79th | Monrad C. Wallgren (D) | Dec. 19, 19402 | Jan. 9, 1945 | Resigned |
| 79th | Hugh B. Mitchell (D) | Jan. 10, 1945 | Dec. 25, 1946 | Appointed; resigned |
| 79th - 82nd | Harry P. Cain (R) | Dec. 26, 19463 | Jan. 3, 1953 | |
| 83rd - 98th | Henry M. (Scoop) Jackson (D) | Jan. 3, 1953 | Sept. 1, 1983 | Died |
| 98th - 100th | Daniel J. Evans (R) | Sept. 8, 1983 | Jan. 3, 1989 | Appointed, then elected |
| 101st - 106th | T. Slade Gorton III (R) | Jan. 3, 1989 | Jan. 3, 2001 | |
| 107th - | Maria E. Cantwell (D) | Jan. 3, 2001 | Present | |
| Class 3 | ||||
| 51st - 54th | Watson C. Squire (R) | Nov. 20, 1889 | Mar. 3, 1897 | |
| 55th - 57th | George Turner (SR, D) | Mar. 4, 1897 | Mar. 3, 1903 | |
| 58th - 60th | Levi Ankeny (R) | Mar. 4, 1903 | Mar. 3, 1909 | |
| 61st - 72nd | Wesley L. Jones (R) | Mar. 4, 1909 | Nov. 19, 1932 | Died |
| 72nd | Elijah S. Grammer (R) | Nov. 22, 1932 | Mar. 3, 1933 | Appointed |
| 73rd - 78th | Homer T. Bone (D) | Mar. 4, 1933 | Nov. 13, 1944 | Resigned |
| 78th - 96th | Warren G. Magnuson4 (D) | Dec. 14, 1944 | Jan. 3, 1981 | |
| 97th - 99th | T. Slade Gorton III (R) | Jan. 3, 1981 | Jan. 3, 1987 | |
| 100th - 102nd | Brockman Adams (D) | Jan. 3, 1987 | Jan. 3, 1993 | |
| 103rd - | Patty Murray (D) | Jan. 3, 1993 | Present | |
1. Reappointed by the governor to serve until Mar. 20, 1893, but did not qualify and was not reseated.
2. Elected to the full term beginning Jan. 3, 1941; subsequently appointed by governor to fill vacancy in term ending Jan. 3, 1941.
3. Elected to the full term beginning Jan. 3, 1947, subsequently appointed by governor to fill vacancy in term ending Jan. 3, 1947.
4. Elected to the full term beginning Jan. 3, 1945; subsequently appointed by governor to fill vacancy in term ending Jan. 3, 1945.
