# List of United States senators in the 51st Congress

This is a complete list of members of the United States Senate during the 51st United States Congress listed by seniority, from March 4, 1889, to March 3, 1891.
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 during the middle of the Congress (up until the last senator who was not sworn in early after winning the November 1890 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 1891 (AL, AR, CA, CO, CT, FL, GA, IA, ID, IL, IN, KS, KY, LA, MD, MO, NC, NH, NV, NY, ND, OH, OR, PA, SC, SD, VT, WA, and WI.) |
| Class 1 | Terms of service of senators that expired in 1893 (CA, CT, DE, FL, IN, MA, MD, ME, MI, MN, MO, MS, MT, ND, NE, NJ, NV, NY, OH, PA, RI, TN, TX, VA, VT, WA, WI, WV, and WY.) |
| Class 2 | Terms of service of senators that expired in 1895 (AL, AR, CO, DE, GA, IA, ID, IL, KS, KY, LA, MA, ME, MI, MN, MS, MT, NC, NE, NH, NJ, 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 | George F. Edmunds (R-VT) | April 3, 1866 | |
| 2 | Justin S. Morrill (R-VT) | March 4, 1867 | |
| 3 | Matt W. Ransom (D-NC) | January 30, 1872 | |
| 4 | William B. Allison (R-IA) | March 4, 1873 | Former representative |
| 5 | John J. Ingalls (R-KS) | March 4, 1873 | |
| 6 | John P. Jones (R-NV) | March 4, 1873 | |
| 7 | Francis Cockrell (D-MO) | March 4, 1875 | |
| 8 | Henry L. Dawes (R-MA) | March 4, 1875 | |
| 9 | George F. Hoar (R-MA) | March 4, 1877 | Former representative |
| 10 | Isham G. Harris (D-TN) | March 4, 1877 | Former governor |
| 11 | John T. Morgan (D-AL) | March 4, 1877 | |
| 12 | John R. McPherson (D-NJ) | March 4, 1877 | |
| 13 | Matthew Butler (D-SC) | March 4, 1877 | |
| 14 | Richard Coke (D-TX) | March 4, 1877 | |
| 15 | Preston B. Plumb (R-KS) | March 4, 1877 | |
| 16 | James B. Beck (D-KY) | March 4, 1877 | |
| 17 | J. Donald Cameron (R-PA) | March 20, 1877 | |
| 18 | Daniel W. Voorhees (D-IN) | November 6, 1877 | |
| 19 | George G. Vest (D-MO) | March 4, 1879 | Missouri 5th in population (1870) |
| 20 | Orville H. Platt (R-CT) | March 4, 1879 | Connecticut 25th in population (1870) |
| 21 | Wilkinson Call (D-FL) | March 4, 1879 | Florida 33rd in population (1870) |
| 22 | Zebulon Vance (D-NC) | March 4, 1879 | |
| 23 | Wade Hampton III (R-SC) | March 4, 1879 | |
| 24 | Joseph E. Brown (D-GA) | May 26, 1880 | |
| 25 | James L. Pugh (D-AL) | November 24, 1880 | |
| 26 | John Sherman (R-OH) | March 4, 1881 | Previously a senator |
| 27 | Eugene Hale (R-ME) | March 4, 1881 | Former representative (10 years) |
| 28 | Joseph R. Hawley (R-CT) | March 4, 1881 | Former representative (5 years) |
| 29 | James Z. George (D-MS) | March 4, 1881 | Mississippi 18th in population (1880) |
| 30 | Arthur P. Gorman (D-MD) | March 4, 1881 | Maryland 20th in population (1880) |
| 31 | Philetus Sawyer (R-WI) | March 4, 1881 | |
| 32 | William P. Frye (R-ME) | March 18, 1881 | |
| 33 | Nelson Aldrich (R-RI) | October 5, 1881 | |
| 34 | Alfred H. Colquitt (D-GA) | March 4, 1883 | |
| 35 | Shelby M. Cullom (R-IL) | March 4, 1883 | Former governor |
| 36 | James F. Wilson (R-IA) | March 4, 1883 | |
| 37 | Charles F. Manderson (R-NE) | March 4, 1883 | |
| 38 | Joseph N. Dolph (R-OR) | March 4, 1883 | |
| 39 | Randall L. Gibson (D-LA) | March 4, 1883 | |
| 40 | John E. Kenna (D-WV) | March 4, 1883 | |
| 41 | Jonathan Chace (R-RI) | January 20, 1885 | |
| 42 | Henry M. Teller (R-CO) | March 4, 1885 | Previously a senator |
| 43 | J. C. S. Blackburn (D-KY) | March 4, 1885 | Former representative |
| 44 | James K. Jones (D-AR) | March 4, 1885 | |
| 45 | Leland Stanford (R-CA) | March 4, 1885 | Former governor |
| 46 | William M. Evarts (R-NY) | March 4, 1885 | |
| 47 | Henry B. Payne (D-OH) | March 4, 1885 | |
| 48 | John C. Spooner (R-WI) | March 4, 1885 | |
| 49 | Ephraim K. Wilson II (D-MD) | March 4, 1885 | |
| 50 | Henry W. Blair (R-NH) | March 5, 1885 | Former representative |
| 51 | Edward C. Walthall (D-MS) | March 9, 1885 | |
| 52 | George Gray (D-DE) | March 18, 1885 | |
| 53 | James H. Berry (D-AR) | March 20, 1885 | |
| 54 | John H. Mitchell (R-OR) | November 18, 1885 | Previously a senator |
| 55 | Charles B. Farwell (R-IL) | January 19, 1887 | |
| 56 | William M. Stewart (R-NV) | March 4, 1887 | Previously a senator (11 years) |
| 57 | David Turpie (D-IN) | March 4, 1887 | Previously a senator (1 month) |
| 58 | John W. Daniel (D-VA) | March 4, 1887 | Former representative |
| 59 | Francis B. Stockbridge (R-MI) | March 4, 1887 | |
| 60 | William B. Bate (D-TN) | March 4, 1887 | Former governor, Tennessee 12th in population (1880) |
| 61 | Cushman K. Davis (R-MN) | March 4, 1887 | Former governor, Minnesota 26th in population (1880) |
| 62 | Matthew Quay (R-PA) | March 4, 1887 | Pennsylvania 2nd in population (1880) |
| 63 | Charles J. Faulkner (D-WV) | March 4, 1887 | West Virginia 29th in population (1880) |
| 64 | Algernon Paddock (R-NE) | March 4, 1887 | |
| 65 | Rufus Blodgett (R-NJ) | March 4, 1887 | |
| 66 | Frank Hiscock (R-NY) | March 4, 1887 | |
| 67 | John H. Reagan (D-TX) | March 4, 1887 | |
| 68 | George Hearst (D-CA) | March 4, 1887 | |
| 69 | Samuel Pasco (D-FL) | May 19, 1887 | |
| 70 | James McMillan (R-MI) | March 4, 1889 | |
| 71 | Edward O. Wolcott (R-CO) | March 4, 1889 | |
| 72 | Anthony Higgins (R-DE) | March 4, 1889 | |
| 73 | William D. Washburn (R-MN) | March 4, 1889 | |
| 74 | John S. Barbour Jr. (D-VA) | March 4, 1889 | |
| 75 | Gilman Marston (R-NH) | March 4, 1889 | |
| | Nathan F. Dixon III (R-RI) | April 10, 1889 | |
| | William E. Chandler (R-NH) | June 18, 1889 | |
| | Richard F. Pettigrew (R-SD) | November 2, 1889 | |
| | Gideon C. Moody (R-SD) | November 2, 1889 | |
| | Watson C. Squire (R-WA) | November 20, 1889 | |
| | John B. Allen (R-WA) | November 20, 1889 | |
| | Gilbert A. Pierce (R-ND) | November 21, 1889 | |
| | Lyman R. Casey (R-ND) | November 25, 1889 | |
| | Wilbur F. Sanders (R-MT) | January 1, 1890 | |
| | Thomas C. Power (R-MT) | January 2, 1890 | |
| | John G. Carlisle (D-KS) | May 26, 1890 | |
| | Joseph M. Carey (R-WY) | November 15, 1890 | |
| | Francis E. Warren (R-WY) | November 24, 1890 | |
| | George L. Shoup (R-ID) | December 18, 1890 | |
| | William J. McConnell (R-ID) | December 18, 1890 | |