# List of United States senators in the 38th Congress

This is a complete list of members of the United States Senate during the 38th United States Congress listed by seniority, from March 4, 1863, to March 3, 1865.
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 1864 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 1865 (AL, AR, CO, DE, GA, IA, IL, KS, KY, LA, MA, ME, MI, MN, MS, NC, NH, NJ, OR, RI, SC, TN, TX, VA, and WV.) |
| Class 3 | Terms of service of senators that expired in 1867 (CA, CT, DE, FL, IN, MA, MD, ME, MI, MN, MO, MS, NJ, NV, NY, OH, PA, RI, TN, TX, VA, VT, WI, and WV) |
| Class 1 | Terms of service of senators that expired in 1869 (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.) |

## 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 | James A. Bayard Jr. (D-DE) | March 4, 1851 | |
| 3 | Benjamin Wade (R-OH) | March 15, 1851 | |
| 4 | Charles Sumner (LR-MA) | April 11, 1851 | |
| 5 | William P. Fessenden (R-ME) | February 10, 1854 | |
| 6 | Henry Wilson (R-MA) | January 31, 1855 | |
| 7 | Lyman Trumbull (R-IL) | March 4, 1855 | |
| 8 | Jacob Collamer (R-VT) | March 4, 1855 | |
| 9 | Lafayette S. Foster (R-CT) | March 4, 1855 | |
| 10 | John P. Hale (R-NH) | July 30, 1855 | |
| 11 | James Harlan (R-IA) | January 29, 1857 | |
| 12 | Zachariah Chandler (R-MI) | March 4, 1857 | |
| 13 | James Dixon (R-CT) | March 4, 1857 | |
| 14 | James R. Doolittle (R-WI) | March 4, 1857 | |
| 15 | Daniel Clark (R-NH) | June 27, 1857 | |
| 16 | Henry B. Anthony (R-RI) | March 4, 1859 | Former governor |
| 17 | Willard Saulsbury Sr. (D-DE) | March 4, 1859 | |
| 18 | James W. Grimes (R-IA) | March 4, 1859 | |
| 19 | Lazarus W. Powell (D-KY) | March 4, 1859 | |
| 20 | Morton S. Wilkinson (R-MN) | March 4, 1859 | |
| 21 | John C. Ten Eyck (R-NJ) | March 4, 1859 | |
| 22 | Timothy O. Howe (R-WI) | March 4, 1861 | |
| 23 | James A. McDougall (D-CA) | March 4, 1861 | |
| 24 | Henry S. Lane (R-WI) | March 4, 1861 | |
| 25 | Ira Harris (R-NJ) | March 4, 1861 | |
| 26 | James Nesmith (D-OR) | March 4, 1861 | |
| 27 | Edgar Cowan (R-PA) | March 4, 1861 | |
| 28 | John Sherman (R-OH) | March 21, 1861 | |
| 29 | Samuel C. Pomeroy (R-KS) | April 4, 1861 | |
| 30 | Jim Lane (R-KS) | April 4, 1861 | |
| 31 | John S. Carlile (U-VA) | July 9, 1861 | |
| 32 | Waitman T. Willey (U-VA) | July 9, 1861 | |
| 33 | Garrett Davis (D-KY) | December 23, 1861 | |
| 34 | Jacob M. Howard (R-MI) | January 17, 1862 | |
| 35 | John B. Henderson (UU-MO) | January 17, 1862 | |
| 36 | Robert Wilson (UU-MO) | January 17, 1862 | |
| 37 | Benjamin F. Harding (D-OR) | September 12, 1862 | |
| 38 | Thomas H. Hicks (UU-MD) | December 29, 1862 | |
| 39 | William A. Richardson (R-IL) | January 12, 1863 | |
| 40 | Alexander Ramsey (R-MN) | March 4, 1863 | |
| 41 | William Sprague IV (R-RI) | March 4, 1863 | |
| 42 | John Conness (R-CA) | March 4, 1863 | |
| 43 | Thomas A. Hendricks (D-IN) | March 4, 1863 | |
| 44 | Reverdy Johnson (UU-MD) | March 4, 1863 | |
| 45 | Edwin D. Morgan (R-NY) | March 4, 1863 | |
| 46 | Charles R. Buckalew (D-PA) | March 4, 1863 | |
| 47 | William Wright (D-NJ) | March 4, 1863 | |
| 48 | Lemuel J. Bowden (UU-VA) | March 4, 1863 | |
| | Waitman T. Willey (R-VA) | August 4, 1863 | |
| | Peter G. Van Winkle (R-WV) | August 4, 1863 | |
| | Benjamin G. Brown (UU-MO) | November 13, 1863 | |
| | George R. Riddle (D-DE) | February 2, 1864 | |
| | Nathan A. Farwell (R-ME) | October 27, 1864 | |
| | William M. Stewart (R-NV) | February 1, 1865 | |
| | James W. Nye (R-NV) | February 1, 1865 | |