# List of United States senators in the 36th Congress

This is a complete list of members of the United States Senate during the 36th United States Congress listed by seniority, from March 4, 1859, to March 3, 1861.
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 1860 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 1861 (AL, AR, CA, CT, FL, GA, IA, IL, IN, KS, KY, LA, MD, MO, NC, NH, NY, OH, OR, PA, SC, VT, and WI.) |
| 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, TX, and VA.) |

## 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 | William H. Seward (R-NY) | March 4, 1849 | |
| 8 | Solomon Foot (R-VT) | March 4, 1851 | |
| 9 | James A. Bayard Jr. (D-DE) | March 4, 1851 | |
| 10 | Stephen Mallory (D-FL) | March 4, 1851 | |
| 11 | Benjamin Wade (R-OH) | March 15, 1851 | |
| 12 | Charles Sumner (LR-MA) | April 11, 1851 | |
| 13 | John R. Thomson (D-NJ) | March 4, 1853 | |
| 14 | Robert Toombs (D-GA) | March 4, 1853 | |
| 15 | Judah P. Benjamin (D-LA) | March 4, 1853 | |
| 16 | Robert Ward Johnson (D-AR) | July 6, 1853 | |
| 17 | Clement Claiborne Clay (D-AL) | November 29, 1853 | |
| 18 | John Slidell (D-LA) | December 5, 1853 | |
| 19 | Albert G. Brown (D-MS) | January 7, 1854 | |
| 20 | William P. Fessenden (R-ME) | February 10, 1854 | |
| 21 | Henry Wilson (R-MA) | January 31, 1855 | |
| 22 | Lyman Trumbull (R-IL) | March 4, 1855 | |
| 23 | Jacob Collamer (R-VT) | March 4, 1855 | |
| 24 | Lafayette S. Foster (R-CT) | March 4, 1855 | |
| 25 | David Levy Yulee (D-FL) | March 4, 1855 | |
| 26 | Alfred Iverson, Sr. (D-GA) | March 4, 1855 | |
| 27 | John Jordan Crittenden (KN-KY) | March 4, 1855 | |
| 28 | George E. Pugh (D-OH) | March 4, 1855 | |
| 29 | Charles Durkee (R-WI) | March 4, 1855 | |
| 30 | John P. Hale (R-NH) | July 30, 1855 | |
| 31 | Benjamin Fitzpatrick (D-AL) | November 26, 1855 | |
| 32 | William Bigler (D-PA) | January 14, 1856 | |
| 33 | James S. Green (D-MO) | January 12, 1857 | |
| 34 | William M. Gwin (D-CA) | January 13, 1857 | |
| 35 | James Harlan (R-IA) | January 29, 1857 | |
| 36 | Graham N. Fitch (D-IN) | February 4, 1857 | |
| 37 | Zachariah Chandler (R-MI) | March 4, 1857 | |
| 38 | James Dixon (R-CT) | March 4, 1857 | |
| 39 | James R. Doolittle (R-WI) | March 4, 1857 | |
| 40 | Anthony Kennedy (KN-MD) | March 4, 1857 | |
| 41 | Trusten Polk (D-MO) | March 4, 1857 | |
| 42 | Preston King (D-NY) | March 4, 1857 | |
| 43 | James F. Simmons (R-RI) | March 4, 1857 | |
| 44 | Hannibal Hamlin (R-ME) | March 4, 1857 | |
| 45 | David C. Broderick (D-CA) | March 4, 1857 | |
| 46 | Jefferson Davis (D-MS) | March 4, 1857 | |
| 47 | Simon Cameron (R-PA) | March 4, 1857 | |
| 48 | Daniel Clark (R-NH) | June 27, 1857 | |
| 49 | Andrew Johnson (D-TN) | October 8, 1857 | |
| 50 | James H. Hammond (D-SC) | December 7, 1857 | |
| 51 | Thomas Lanier Clingman (D-NC) | May 7, 1858 | |
| 52 | Henry Mower Rice (D-MN) | May 11, 1858 | |
| 53 | Matthias Ward (D-TX) | September 27, 1858 | |
| 54 | James Chesnut, Jr. (D-SC) | December 3, 1858 | |
| 55 | Joseph Lane (D-OR) | February 14, 1859 | |
| 56 | Henry B. Anthony (R-RI) | March 4, 1859 | Former governor |
| 57 | Willard Saulsbury, Sr. (D-DE) | March 4, 1859 | |
| 58 | James W. Grimes (R-IA) | March 4, 1859 | |
| 59 | Lazarus W. Powell (D-KY) | March 4, 1859 | |
| 60 | Morton S. Wilkinson (R-MN) | March 4, 1859 | |
| 61 | John C. Ten Eyck (R-NJ) | March 4, 1859 | |
| 62 | Kinsley S. Bingham (D-MI) | March 4, 1859 | |
| 63 | Thomas Bragg (D-NC) | March 4, 1859 | |
| 64 | John Hemphill (D-TX) | March 4, 1859 | |
| 65 | Alfred Osborn Pope Nicholson (D-TN) | March 4, 1859 | |
| | Henry P. Haun (D-CA) | November 3, 1859 | |
| | Louis Wigfall (D-TX) | December 5, 1859 | |
| | Milton Latham (LD-CA) | March 5, 1860 | |
| | Edward D. Baker (R-OR) | October 2, 1860 | |