# List of United States senators in the 25th Congress

This is a complete list of members of the United States Senate during the 25th United States Congress listed by seniority, from March 4, 1837, to March 3, 1839.
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 two-year congressional term (up until the last senator who was not sworn in early after winning the November 1838 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 1839 (CT, DE, IN, MA, MD, ME, MI, MO, MS, NJ, NY, OH, PA, RI, TN, VA, and VT.) |
| Class 2 | Terms of service of senators that expired in 1841 (AL, AR, DE, GA, IL, KY, LA, MA, ME, MI, MS, NC, NH, NJ, RI, SC, TN, and VA.) |
| Class 3 | Terms of service of senators that expired in 1843 (AL, AR, CT, GA, IL, IN, KY, LA, MD, MO, NC, NH, NY, OH, PA, SC, and VT.) |

## U.S. Senate seniority list

U.S. Senate seniority :
| Rank | Senator (party-state) | Seniority date | Other factors |
| 1 | William Rufus de Vane King (D-AL) | December 14, 1819 | |
| 2 | Nehemiah Rice Knight (W-RI) | January 9, 1821 |
| 3 | Thomas Hart Benton (D-MO) | August 10, 1821 |
| 4 | Hugh Lawson White (W-TN) | October 28, 1825 |
| 5 | Ashur Robbins (W-RI) | October 31, 1825 |
| 6 | Daniel Webster (W-MA) | June 8, 1827 |
| 7 | Felix Grundy (D-TN) | October 19, 1829 |
| 8 | Bedford Brown (D-NC) | December 9, 1829 |
| 9 | John McCracken Robinson (D-IL) | December 11, 1830 |
| 10 | Samuel Prentiss (AJ-VT) | March 4, 1831 |
| 11 | Henry Clay (W-KY) | November 10, 1831 |
| 12 | John Tipton (D-IN) | January 3, 1832 |
| 13 | John Black (W-MS) | November 12, 1832 |
| 14 | John Caldwell Calhoun (D-SC) | December 29, 1832 |
| 15 | Silas Wright, Jr. (D-NY) | January 4, 1833 |
| 16 | Samuel Lewis Southard (W-NJ) | March 4, 1833 | Former senator |
| 17 | Joseph Kent (AJ-MD) | March 4, 1833 | Former representative (10 years) |
| 18 | Samuel McKean (D-PA) | March 4, 1833 | Former representative (6 years) |
| 19 | Benjamin Swift (AJ-VT) | March 4, 1833 | Former representative (4 years) |
| 20 | Nathaniel Pitcher Tallmadge (AJ-NY) | March 4, 1833 | New York 1st in population (1830) |
| 21 | Thomas Morris (J-OH) | March 4, 1833 | Ohio 4th in population (1830) |
| 22 | Lewis Fields Linn (D-MO) | October 25, 1833 |
| 23 | John Pendleton King (D-GA) | November 21, 1833 |
| 24 | William Campbell Preston (N-SC) | November 26, 1833 |
| 25 | James Buchanan (D-PA) | December 6, 1834 |
| 26 | Alfred Cuthbert (D-MD) | January 12, 1835 |
| 27 | John Ruggles (D-ME) | January 20, 1835 |
| 28 | John Jordan Crittenden (W-KY) | March 4, 1835 | Former senator |
| 29 | Henry Hubbard (D-NH) | March 4, 1835 | Former representative |
| 30 | John Davis (W-MA) | March 4, 1835 | Former governor |
| 31 | Garret Dorset Wall (D-NJ) | March 4, 1835 | New Jersey 14th in population (1830) |
| 32 | Robert John Walker (D-MS) | March 4, 1835 | Mississippi 22nd in population (1830) |
| 33 | John Milton Niles (D-CT) | December 21, 1835 |
| 34 | Robert Carter Nicholas (D-LA) | January 13, 1836 |
| 35 | William Cabell Rives (D-VA) | March 4, 1836 |
| 36 | Richard Henry Bayard (AJ-DE) | June 17, 1836 |
| 37 | Ambrose Hundley Sevier (D-AR) | September 18, 1836 | Former delegate |
| 38 | William Savin Fulton (D-AR) | September 18, 1836 |
| 39 | Robert Strange (D-NC) | December 5, 1836 |
| 40 | Richard Elliott Parker (D-VA) | December 12, 1836 |
| 41 | John Selby Spence (W-MD) | December 31, 1836 |
| 42 | Thomas Clayton (W-DE) | January 9, 1837 |
| 43 | Alexander Mouton (D-LA) | January 12, 1837 |
| 44 | Lucius Lyon (D-MI) | January 26, 1837 | Former delegate |
| 45 | John Norvell (D-MI) | January 26, 1837 |
| 46 | Franklin Pierce (D-NH) | March 4, 1837 | Former representative (4 years) |
| 47 | William Allen (D-OH) | March 4, 1837 | Former representative (2 years); Ohio 5th in population (1830) |
| 48 | Oliver Hampton Smith (W-IN) | March 4, 1837 | Former representative (2 years); Indiana 13th in population (1830) |
| 49 | Reuel Williams (D-ME) | March 4, 1837 | Maine 12th in population (1830) |
| 50 | Perry Smith (D-CT) | March 4, 1837 | Connecticut 16th in population (1830) |
| 51 | Richard Montgomery Young (D-IL) | March 4, 1837 | Illinois 20th in population (1830) |
| | William Henry Roane (D-VA) | March 14, 1837 |
| 52 | John McKinley (D-AL) | Did not qualify |
| | Clement Comer Clay (D-AL) | June 19, 1837 |
| | Wilson Lumpkin (D-GA) | November 22, 1837 |
| | William Duhurst Merrick (W-MD) | January 4, 1838 |
| | James Fisher Trotter (D-MS) | January 22, 1838 |
| | Ephraim Hubbard Foster (W-TN) | September 17, 1838 |
| | Thomas Hickman Williams (D-MS) | November 12, 1838 |