# List of United States senators in the 15th Congress

This is a complete list of members of the United States Senate during the 15th United States Congress listed by seniority, from March 4, 1817, to March 3, 1819.
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.
The two main parties at this point were the Federalists (F), and Democratic Republicans (DR). At the end of this congress, there was one person elected who was an Anti-Democrat (AD).

## Terms of service

| Class | Terms of service of senators that expired in years |
| Class 3 | Terms of service of senators that expired in 1819 (CT, GA, IL, IN, KY, LA, MD, NC, NH, NY, OH, PA, SC, and VT.) |
| Class 1 | Terms of service of senators that expired in 1821 (CT, DE, IN, MA, MD, MS, NJ, NY, OH, PA, RI, TN, VA, and VT.) |
| Class 2 | Terms of service of senators that expired in 1823 (DE, GA, IL, KY, LA, MA, MS, NC, NH, NJ, RI, SC, TN, and VA.) |

## U.S. Senate seniority list

U.S. Senate seniority :
| Rank | Senator (party-state) | Seniority date | Other factors |
| 1 | John Gaillard (F-SC) | December 6, 1804 | |
| 2 | Charles Tait (F-GA) | November 27, 1809 |
| 3 | Outerbridge Horsey (F-DE) | January 12, 1810 |
| 4 | Samuel Whittlesey Dana (F-CT) | December 4, 1810 |
| 5 | William Hunter (F-RI) | October 28, 1811 |
| 6 | Dudley Chase (DR-VT) | March 4, 1813 | Vermont 14th in population (1810) |
| 7 | Eligius Fromentin (DR-LA) | March 4, 1813 | Louisiana 17th in population (1810) |
| 8 | Rufus King (F-NY) | March 4, 1813 | Former senator |
| 9 | Abner Lacock (DR-PA) | March 4, 1813 | Former representative (2 years) |
| 10 | Jeremiah Morrow (DR-OH) | March 4, 1813 | Former representative (10 years) |
| 11 | David Daggett (F-CT) | May 13, 1813 |
| 12 | Robert Henry Goldsborough (F-MD) | May 21, 1813 |
| 13 | Jeremiah Mason (F-NH) | June 10, 1813 |
| 14 | Jonathan Roberts (DR-PA) | February 24, 1814 |
| 15 | James Barbour (DR-VA) | January 2, 1815 |
| 16 | Isham Talbot (DR-KY) | February 2, 1815 |
| 17 | Benjamin Ruggles (DR-OH) | March 4, 1815 | Ohio 13th in population (1810) |
| 18 | Nathan Sanford (DR-NY) | March 4, 1815 | New York 1st in population (1810) |
| 19 | Isaac Tichenor (F-VT) | March 4, 1815 | Former senator |
| 20 | James Jefferson Wilson (DR-NJ) | March 4, 1815 | New Jersey 12th in population (1810) |
| 21 | George Washington Campbell (DR-TN) | October 10, 1815 | Former senator |
| 22 | John Williams (DR-TN) | October 10, 1815 |
| 23 | Nathaniel Macon (DR-NC) | December 5, 1815 |
| 24 | Eli Porter Ashmun (F-MA) | June 12, 1816 |
| 25 | William Smith (DR-SC) | November 3, 1816 | South Carolina 6th in population (1810) |
| 26 | George Michael Troup (DR-GA) | November 13, 1816 |
| 27 | Montfort Stokes (DR-NC) | December 4, 1816 | North Carolina 4th in population (1810) |
| 28 | James Noble (DR-IN) | December 11, 1816 | Alphabetical (N) |
| 29 | Waller Taylor (DR-IN) | December 11, 1816 | Alphabetical (T) |
| 30 | Alexander Contee Hanson (F-MD) | December 20, 1816 |
| 31 | John Wayles Eppes (DR-VA) | March 4, 1817 | Former representative (10 years) |
| 32 | Harrison Gray Otis (F-MA) | March 4, 1817 | Former representative (4 years) |
| 33 | Nicholas Van Dyke (F-DE) | March 4, 1817 | Former representative (3 years, 4 months) |
| 34 | William Charles Cole Claiborne (DR-LA) | March 4, 1817 | Former representative (3 years, 3 months) |
| 35 | Mahlon Dickerson (DR-NJ) | March 4, 1817 | Former governor |
| 36 | John Jordan Crittenden (DR-KY) | March 4, 1817 | Kentucky 7th in population (1810) |
| 37 | David Lawrence Morril (DR-NH) | March 4, 1817 | New Hampshire 15th in population (1810) |
| 38 | James Burrill, Jr. (F-RI) | March 4, 1817 | Rhode Island 16th in population (1810) |
| 39 | Clement Storer (DR-NH) | June 27, 1817 |
| 40 | James Fisk (DR-VT) | November 4, 1817 |
| 41 | Walter Leake (DR-MS) | December 10, 1817 | Alphabetical (L) |
| 42 | Thomas Hill Williams (DR-MS) | December 10, 1817 | Alphabetical (W) |
| 43 | Henry Johnson (DR-LA) | January 12, 1818 |
| 44 | Prentiss Mellen (F-MA) | June 5, 1818 |
| 45 | John Henry Eaton (DR-TN) | September 5, 1818 |
| 46 | William Adams Palmer (DR-VT) | October 20, 1818 |
| 47 | John Forsyth (DR-GA) | November 23, 1818 | |
| 48 | Ninian Edwards (DR-IL) | December 3, 1818 |
| 49 | Jesse Burgess Thomas (DR-IL) | December 3, 1818 | Former delegate |