# List of United States senators in the 37th Congress

This is a complete list of members of the United States Senate during the 37th United States Congress listed by seniority, from March 4, 1861, to March 3, 1863.
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 1862 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 1 | Terms of service of senators that expired in 1863 (CA, CT, DE, FL, IN, MA, MD, ME, MI, MN, MO, MS, NJ, NY, OH, PA, RI, TN, TX, VA, VT, and WI.) |
| Class 2 | Terms of service of senators that expired in 1865 (AL, AR, DE, GA, IA, IL, KS, KY, LA, MA, ME, MI, MN, MS, NC, NH, NJ, OR, RI, SC, TN, and TX.) |
| 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, 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 | James Alfred Pearce (D-MD) | March 4, 1843 | |
| 2 | Jesse D. Bright (D-IN) | March 4, 1845 | |
| 3 | James M. Mason (D-VA) | January 21, 1847 | |
| 4 | Stephen A. Douglas (D-IL) | March 4, 1847 | |
| 5 | Robert M. T. Hunter (D-VA) | March 4, 1847 | |
| 6 | William K. Sebastian (D-AR) | May 12, 1848 | |
| 7 | Solomon Foot (R-VT) | March 4, 1851 | |
| 8 | James A. Bayard Jr. (D-DE) | March 4, 1851 | |
| 9 | Benjamin Wade (R-OH) | March 15, 1851 | |
| 10 | Charles Sumner (LR-MA) | April 11, 1851 | |
| 11 | John R. Thomson (D-NJ) | March 4, 1853 | |
| 12 | William P. Fessenden (R-ME) | February 10, 1854 | |
| 13 | Henry Wilson (R-MA) | January 31, 1855 | |
| 14 | Lyman Trumbull (R-IL) | March 4, 1855 | |
| 15 | Jacob Collamer (R-VT) | March 4, 1855 | |
| 16 | Lafayette S. Foster (R-CT) | March 4, 1855 | |
| 17 | John P. Hale (R-NH) | July 30, 1855 | |
| 18 | James Harlan (R-IA) | January 29, 1857 | |
| 19 | Zachariah Chandler (R-MI) | March 4, 1857 | |
| 20 | James Dixon (R-CT) | March 4, 1857 | |
| 21 | James R. Doolittle (R-WI) | March 4, 1857 | |
| 22 | Anthony Kennedy (KN-MD) | March 4, 1857 | |
| 23 | Trusten Polk (D-MO) | March 4, 1857 | |
| 24 | Preston King (R-NY) | March 4, 1857 | |
| 25 | James F. Simmons (R-RI) | March 4, 1857 | |
| 26 | Daniel Clark (R-NH) | June 27, 1857 | |
| 27 | Andrew Johnson (D-TN) | October 8, 1857 | |
| 28 | Thomas Lanier Clingman (D-NC) | May 7, 1858 | |
| 29 | Henry Mower Rice (D-MN) | May 11, 1858 | |
| 30 | Henry B. Anthony (R-RI) | March 4, 1859 | Former governor |
| 31 | Willard Saulsbury Sr. (D-DE) | March 4, 1859 | |
| 32 | James W. Grimes (R-IA) | March 4, 1859 | |
| 33 | Lazarus W. Powell (D-KY) | March 4, 1859 | |
| 34 | Morton S. Wilkinson (R-MN) | March 4, 1859 | |
| 35 | John C. Ten Eyck (R-NJ) | March 4, 1859 | |
| 36 | Kinsley S. Bingham (D-MI) | March 4, 1859 | |
| 37 | Thomas Bragg (D-NC) | March 4, 1859 | |
| 38 | John Hemphill (D-TX) | March 4, 1859 | |
| 39 | Louis Wigfall (D-TX) | December 5, 1859 | |
| 40 | Milton Latham (LD-CA) | March 5, 1860 | |
| 41 | Edward D. Baker (R-OR) | October 2, 1860 | |
| 42 | Timothy O. Howe (R-WI) | March 4, 1861 | |
| 43 | James A. McDougall (D-CA) | March 4, 1861 | |
| 44 | Henry S. Lane (R-WI) | March 4, 1861 | |
| 45 | Ira Harris (R-NJ) | March 4, 1861 | |
| 46 | James Nesmith (D-OR) | March 4, 1861 | |
| 47 | Edgar Cowan (R-PA) | March 4, 1861 | |
| 48 | Charles B. Mitchel (D-AR) | March 4, 1861 | |
| 49 | John C. Breckinridge (D-KY) | March 4, 1861 | |
| 50 | Salmon P. Chase (D-OH) | March 4, 1861 | |
| | David Wilmot (R-PA) | March 14, 1861 | |
| | Waldo P. Johnson (D-MO) | March 17, 1861 | |
| | John Sherman (R-OH) | March 21, 1861 | |
| | Samuel C. Pomeroy (R-KS) | April 4, 1861 | |
| | Jim Lane (R-KS) | April 4, 1861 | |
| | Orville H. Browning (R-IL) | June 26, 1861 | |
| | John S. Carlile (U-VA) | July 9, 1861 | |
| | Waitman T. Willey (U-VA) | July 9, 1861 | |
| | Benjamin Stark (D-OR) | October 29, 1861 | |
| | Garrett Davis (U-KY) | December 23, 1861 | |
| | Jacob M. Howard (R-MI) | January 17, 1862 | |
| | John B. Henderson (U-MO) | January 17, 1862 | |
| | Robert Wilson (U-MO) | January 17, 1862 | |
| | Joseph A. Wright (D-IN) | February 24, 1862 | |
| | Benjamin F. Harding (D-OR) | September 12, 1862 | |
| | Richard Stockton Field (R-NJ) | November 21, 1862 | |
| | Samuel G. Arnold (R-RI) | December 1, 1862 | |
| | Thomas H. Hicks (U-MD) | December 29, 1862 | |
| | William A. Richardson (D-IL) | January 12, 1863 | |
| | David Turpie (D-IN) | January 14, 1863 | |
| | James W. Wall (D-NJ) | January 14, 1863 | |