Rank | Senator (party-state) | Seniority date | Other factors |
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1 | William B. Allison (R-IA) [7] | March 4, 1873 |
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2 | John Tyler Morgan (D-AL) [8] | March 4, 1877 |
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3 | Eugene Hale (R-ME) | March 4, 1881 |
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4 | William P. Frye (R-ME) | March 18, 1881 |
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5 | Nelson Aldrich (R-RI) | October 5, 1881 |
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6 | Shelby Moore Cullom (R-IL) | March 4, 1883 |
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7 | Henry M. Teller (D-CO) | March 4, 1885 |
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8 | John W. Daniel (D-VA) | March 4, 1887 |
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9 | Jacob H. Gallinger (R-NH) | March 4, 1891 |
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10 | Henry C. Hansbrough (R-ND) |
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11 | Redfield Proctor (R-VT) [9] | November 2, 1891 |
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12 | Henry Cabot Lodge (R-MA) | March 4, 1893 |
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13 | George C. Perkins (R-CA) | July 26, 1893 |
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14 | Julius C. Burrows (R-MI) | January 23, 1895 |
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15 | Clarence D. Clark (R-WY) | January 24, 1895 |
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16 | Francis E. Warren (R-WY) | March 4, 1895 | Previously served 1890–1893 |
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17 | Augustus O. Bacon (D-GA) |
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18 | Stephen Elkins (R-WV) |
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19 | Thomas S. Martin (D-VA) |
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20 | Knute Nelson (R-MN) |
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21 | Benjamin Tillman (D-SC) |
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22 | John C. Spooner (R-WI) [10] | March 4, 1897 | Previously served 1885–1891 |
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23 | Thomas C. Platt (R-NY) | Previously served 1881 |
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24 | Alexander Clay (D-GA) |
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25 | Joseph Foraker (R-OH) |
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26 | Samuel McEnery (D-LA) |
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27 | Boies Penrose (R-PA) |
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28 | Edmund Pettus (D-AL) [11] |
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29 | Stephen Mallory (D-FL) [12] |
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30 | Hernando Money (D-MS) | October 8, 1897 |
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31 | Charles A. Culberson (D-TX) | March 4, 1899 |
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32 | Chauncey Depew (R-NY) |
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33 | Albert J. Beveridge (R-IN) |
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34 | John Kean (R-NJ) |
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35 | Porter McCumber (R-ND) |
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36 | Nathan B. Scott (R-WV) |
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37 | James Taliaferro (D-FL) | April 20, 1899 |
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38 | Jonathan P. Dolliver (R-IA) | August 22, 1900 |
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39 | William P. Dillingham (R-VT) | October 18, 1900 |
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40 | Moses Clapp (R-MN) | January 23, 1901 |
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41 | Anselm J. McLaurin (D-MS) | March 4, 1901 | Previously served 1894–1895 |
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42 | Joseph W. Bailey (D-TX) |
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43 | Henry E. Burnham (R-NH) |
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44 | Murphy J. Foster (D-LA) |
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45 | Robert J. Gamble (R-SD) |
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46 | Furnifold M. Simmons (D-NC) |
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47 | Alfred B. Kittredge (R-SD) | July 1, 1901 |
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48 | Levi Ankeny (R-WA) | March 4, 1903 |
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49 | James P. Clarke (D-AR) |
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50 | Charles W. Fulton (R-OR) |
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51 | Weldon B. Heyburn (R-ID) |
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52 | Albert J. Hopkins (R-IL) |
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53 | Asbury Latimer (D-SC) [13] |
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54 | Chester Long (R-KS) |
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55 | James B. McCreary (D-KY) |
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56 | Francis Newlands (D-NV) |
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57 | Lee S. Overman (D-NC) |
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58 | Reed Smoot (R-UT) |
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59 | William J. Stone (D-MO) |
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60 | Charles Dick (R-OH) | March 23, 1904 |
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61 | Philander C. Knox (R-PA) | June 10, 1904 |
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62 | Winthrop M. Crane (R-MA) | October 12, 1904 |
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63 | Thomas Carter (R-MT) | March 4, 1905 | Previously served 1895–1901 |
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64 | Morgan Bulkeley (R-CT) |
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65 | Elmer Burkett (R-NE) |
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66 | Frank P. Flint (R-CA) |
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67 | James Hemenway (R-IN) |
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68 | George S. Nixon (R-NV) |
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69 | Samuel H. Piles (R-WA) |
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70 | Isidor Rayner (D-MD) |
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71 | George Sutherland (R-UT) |
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72 | William Warner (R-MO) | March 18, 1905 |
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73 | James B. Frazier (D-TN) | March 21, 1905 |
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74 | Frank B. Brandegee (R-CT) | May 10, 1905 |
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75 | Robert M. La Follette, Sr. (R-WI) | January 4, 1906 |
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76 | William Pinkney Whyte (D-MD) [14] | June 8, 1906 |
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77 | Henry du Pont (R-DE) | June 13, 1906 |
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78 | Charles Curtis (R-KS) | January 29, 1907 |
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79 | William A. Smith (R-MI) | February 9, 1907 |
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80 | William Borah (R-ID) | March 4, 1907 |
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81 | Jonathan Bourne, Jr. (R-OR) |
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82 | Frank O. Briggs (R-NJ) |
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83 | Norris Brown (R-NE) |
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84 | Jeff Davis (D-AR) |
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85 | Joseph M. Dixon (R-MT) |
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86 | Simon Guggenheim (R-CO) |
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87 | Thomas H. Paynter (D-KY) |
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88 | Harry A. Richardson (R-DE) |
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89 | Robert Love Taylor (D-TN) |
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90 | Isaac Stephenson (R-WI) | May 17, 1907 |
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| John H. Bankhead (D-AL) | June 18, 1907 |
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| Joseph F. Johnston (D-AL) | August 6, 1907 |
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| Thomas Gore (D-OK) | December 11, 1907 |
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| Robert Owen (D-OK) | December 11, 1907 |
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| William J. Bryan (D-FL) | December 26, 1907 |
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| George P. Wetmore (D-RI) | January 22, 1908 |
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| Frank B. Gary (D-SC) [15] | March 6, 1908 |
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| John W. Stewart (R-VT) | March 24, 1908 |
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| John Walter Smith (D-MD) | March 25, 1908 |
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| William H. Milton (D-FL) | March 27, 1908 |
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| Carroll S. Page (R-VT) | October 21, 1908 |
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| Albert B. Cummins (R-IA) | November 24, 1908 |
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