This is a classification of United States Senators by seniority from March 4, 1803 to March 3, 1805.
he order of service is based on the commencement of the senator's first term, with senators entering service the same day ranked alphabetically.[1]
The two main parties in the 8th Congress were the Federalists (F), and Democratic Republicans (DR).
| Rank | Name (Party-State) | Seniority date |
|---|---|---|
| 1 | John Brown (DR-KY) | June 18, 1792 |
| 2 | Stevens Thomson Mason (DR-VA)[2] | November 18, 1794 |
| 3 | Uriah Tracy (F-CT) | October 13, 1796 |
| 4 | James Hillhouse (F-MD) | December 1796 |
| 5 | Joseph Inslee Anderson (DR-TN) | September 26, 1797 |
| 6 | William Hill Wells (F-DE)[3] | January 17, 1799 |
| 7 | Abraham Baldwin (DR-GA) | March 4, 1799 |
| 8 | William Cocke (DR-TN) | |
| 9 | Jonathan Dayton (F-NJ) | |
| 10 | Jesse Franklin (DR-NC) | |
| 11 | Wilson Cary Nicholas (DR-VA)[4] | December 5, 1799 |
| 12 | Samuel White (F-DE) | February 28, 1801 |
| 15 | John Breckinridge (DR-KY) | March 4, 1801 |
| 13 | James Jackson (DR-GA) | |
| 14 | David Stone (DR-NC) | |
| 16 | Christopher Ellery (DR-RI) | May 6, 1801 |
| 17 | Simeon Olcott (F-NH) | June 17, 1801 |
| 18 | George Logan (DR-PA) | July 13, 1801 |
| 19 | Stephen Row Bradley (DR-VT) | October 15, 1801 |
| 20 | Robert Wright (DR-MD) | November 19, 1801 |
| 21 | Thomas Sumter (DR-SC) | December 16, 1801 |
| 22 | De Witt Clinton (DR-NY)[5] | February 9, 1802 |
| 23 | William Plumer (F-NH) | June 17, 1802 |
| 24 | Pierce Butler (DR-SC)[6] | November 4, 1802 |
| 25 | John Quincy Adams (F-MA) | March 4, 1803 |
| 26 | Theodorus Bailey (DR-NY)[7] | |
| 27 | Samuel Maclay (DR-PA) | |
| 28 | Timothy Pickering (F-MA) | |
| 29 | Samuel John Potter (DR-RI)[8] | |
| 30 | Israel Smith (DR-VT) | |
| 31 | Samuel Smith (DR-MD) | |
| 32 | John Smith (DR-OH) | April 1, 1803 |
| 33 | Thomas Worthington (DR-OH) | |
| John Taylor (DR-VA)[9] | June 4, 1803 | |
| 34 | John Condit (DR-NJ) | September 1, 1803 |
| Abraham B. Venable (DR-VA)[10] | December 7, 1803 | |
| John Smith (DR-NY) | February 23, 1804 | |
| John Armstrong, Jr. (DR-NY)[11] | February 25, 1804 | |
| William Branch Giles (DR-VA) | August 11, 1804 | |
| Andrew Moore (DR-VA) | ||
| Benjamin Howland (DR-RI) | October 29, 1804 | |
| James A. Bayard, Sr. (F-DE) | November 9, 1804 | |
| Samuel Latham Mitchill (DR-NY) | November 13, 1804 | |
| John Gaillard (DR-SC) | December 6, 1804 |
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