# List of United States senators in the 39th Congress

This is a complete list of members of the United States Senate during the 39th United States Congress listed by seniority, from March 4, 1865, to March 3, 1867.
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 1866 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 1867 (AL, AR, CA, CT, FL, GA, IA, IL, IN, KS, KY, LA, MD, MO, NC, NH, NV, NY, OH, OR, PA, SC, VT, and WI.) |
| Class 1 | Terms of service of senators that expired in 1869 (CA, CT, DE, FL, IN, MA, MD, ME, MI, MN, MO, MS, NE, NJ, NV, NY, OH, PA, RI, TN, TX, VA, VT, WI, and WV) |
| Class 2 | Terms of service of senators that expired in 1871 (AL, AR, DE, GA, IA, IL, KS, KY, LA, MA, ME, MI, MN, MS, NC, NE, NH, NJ, OR, RI, SC, TN, TX, VA, and WV.) |

## U.S. Senate seniority list

U.S. Senate seniority :
| Rank | Senator (party-state) | Seniority date | Other factors |
| 1 | Solomon Foot (R-VT) | March 4, 1851 | |
| 2 | Benjamin Wade (R-OH) | March 15, 1851 | |
| 3 | Charles Sumner (LR-MA) | April 11, 1851 | |
| 4 | Henry Wilson (R-MA) | January 31, 1855 | |
| 5 | Lyman Trumbull (R-IL) | March 4, 1855 | |
| 6 | Jacob Collamer (R-VT) | March 4, 1855 | |
| 7 | Lafayette S. Foster (R-CT) | March 4, 1855 | |
| 8 | James Harlan (R-IA) | January 29, 1857 | |
| 9 | Zachariah Chandler (R-MI) | March 4, 1857 | |
| 10 | James Dixon (R-CT) | March 4, 1857 | |
| 11 | James R. Doolittle (R-WI) | March 4, 1857 | |
| 12 | Daniel Clark (R-NH) | June 27, 1857 | |
| 13 | Henry B. Anthony (R-RI) | March 4, 1859 | Former governor |
| 14 | Willard Saulsbury Sr. (D-DE) | March 4, 1859 | |
| 15 | James W. Grimes (R-IA) | March 4, 1859 | |
| 16 | Timothy O. Howe (R-WI) | March 4, 1861 | |
| 17 | James A. McDougall (D-CA) | March 4, 1861 | |
| 18 | Henry S. Lane (R-WI) | March 4, 1861 | |
| 19 | Ira Harris (R-NJ) | March 4, 1861 | |
| 20 | James Nesmith (D-OR) | March 4, 1861 | |
| 21 | Edgar Cowan (R-PA) | March 4, 1861 | |
| 22 | John Sherman (R-OH) | March 21, 1861 | |
| 23 | Samuel C. Pomeroy (R-KS) | April 4, 1861 | |
| 24 | Jim Lane (R-KS) | April 4, 1861 | |
| 25 | Garrett Davis (U-KY) | December 23, 1861 | |
| 26 | Jacob M. Howard (R-MI) | January 17, 1862 | |
| 27 | Alexander Ramsey (R-MN) | March 4, 1863 | |
| 28 | William Sprague IV (R-RI) | March 4, 1863 | |
| 29 | John Conness (R-CA) | March 4, 1863 | |
| 30 | Thomas A. Hendricks (D-IN) | March 4, 1863 | |
| 31 | Reverdy Johnson (D-MD) | March 4, 1863 | |
| 32 | Edwin D. Morgan (R-NY) | March 4, 1863 | |
| 33 | Charles R. Buckalew (D-PA) | March 4, 1863 | |
| 34 | William Wright (D-NJ) | March 4, 1863 | |
| 35 | Waitman T. Willey (R-VA) | August 4, 1863 | |
| 36 | Peter G. Van Winkle (U-WV) | August 4, 1863 | |
| 37 | Benjamin G. Brown (D-MO) | November 13, 1863 | |
| 38 | George R. Riddle (D-DE) | February 2, 1864 | |
| 39 | William M. Stewart (R-NV) | February 1, 1865 | |
| 40 | James W. Nye (R-NV) | February 1, 1865 | |
| 41 | Aaron H. Cragin (R-NH) | March 4, 1865 | |
| 42 | Richard Yates (R-IL) | March 4, 1865 | |
| 43 | William P. Fessenden (R-ME) | March 4, 1865 | |
| 44 | Daniel S. Norton (R-MN) | March 4, 1865 | |
| 45 | George H. Williams (R-OR) | March 4, 1865 | |
| 46 | James Guthrie (D-KY) | March 4, 1865 | |
| 47 | John Creswell (UU-MD) | March 9, 1865 | |
| 48 | John P. Stockton (D-NJ) | March 15, 1865 | |
| | Luke P. Poland (R-VT) | November 21, 1865 | |
| | Samuel J. Kirkwood (R-IA) | January 13, 1866 | |
| | George F. Edmunds (R-VT) | April 3, 1866 | |
| | Edmund G. Ross (R-KS) | July 19, 1866 | |
| | Joseph S. Fowler (U-TN) | July 24, 1866 | |
| | David T. Patterson (U-TN) | July 28, 1866 | |
| | George G. Fogg (R-NH) | August 31, 1866 | |
| | Alexander G. Cattell (R-NJ) | September 19, 1866 | |
| | Thomas Tipton (R-NE) | March 1, 1867 | |
| | John Milton Thayer (R-NE) | March 1, 1867 | |