# List of United States senators in the 30th Congress

This is a complete list of members of the United States Senate during the 30th United States Congress listed by seniority, from March 4, 1847, to March 3, 1849.
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 1848 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 1849 (AL, AR, CT, FL, GA, IA, IL, IN, KY, LA, MD, MO, NC, NH, NY, OH, PA, SC, VT, and WI.) |
| Class 1 | Terms of service of senators that expired in 1851 (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 1853 (AL, AR, DE, GA, IA, IL, KY, LA, MA, ME, MI, MS, NC, NH, NJ, RI, SC, TN, TX, and VA.) |

## U.S. Senate seniority list

U.S. Senate seniority :
| Rank | Senator (party-state) | Seniority date | Other factors |
| 1 | Thomas Hart Benton (D-MO) | August 10, 1821 | |
| 2 | Ambrose Hundley Sevier (D-AR) | September 18, 1836 |
| 3 | William Allen (D-OH) | March 4, 1837 |
| 4 | Samuel Shethar Phelps (W-VT) | March 4, 1839 |
| 5 | Daniel Sturgeon (D-PA) | January 14, 1840 |
| 6 | Jabez Williams Huntington (W-CT) | May 4, 1840 |
| 7 | Willie Person Mangum (W-NC) | November 25, 1840 |
| 10 | John Macpherson Berrien (W-GA) | March 4, 1841 | Former senator (4 years) |
| 11 | Jacob Welsh Miller (W-NJ) | March 4, 1841 | New Jersey 14th in population (1830) |
| 12 | Arthur Pendleton Bagby (D-AL) | November 24, 1841 |
| 13 | John Jordan Crittenden (W-KY) | March 31, 1842 |
| 14 | William Lewis Dayton (W-NJ) | July 2, 1842 |
| 15 | James Alfred Pearce (W-MD) | March 4, 1843 | Former representative (6 years); Maryland 15th in population (1840) |
| 16 | Charles Gordon Atherton (D-NH) | March 4, 1843 | Former representative (6 years); New Hampshire 22nd in population (1840) |
| 17 | Edward Allen Hannegan (D-IN) | March 4, 1843 | Former representative (4 years) |
| 18 | Walter Terry Colquitt (D-GA) | March 4, 1843 | Former representative (1 year) |
| 19 | Sidney Breese (D-IL) | March 4, 1843 | Illinois 14th in population (1840) |
| 20 | William Upham (W-VT) | March 4, 1843 | Vermont 21st in population (1840) |
| 21 | David Rice Atchison (D-MO) | October 14, 1843 |
| 22 | John Fairfield (W-ME) | December 4, 1843 | Maine 13th in population (1840) |
| 23 | Henry Johnson (W-LA) | February 12, 1844 |
| 24 | Dixon Hall Lewis (D-AL) | April 22, 1844 |
| 25 | John Milton Niles (D-CT) | May 16, 1844 |
| 26 | Chester Ashley (D-AR) | November 8, 1844 |
| 27 | Daniel Stevens Dickinson (D-NY) | November 30, 1844 |
| 28 | John Adams Dix (D-NY) | January 27, 1845 |
| 29 | Daniel Webster (W-MA) | March 4, 1845 | Former senator (13 years) |
| 30 | John Middleton Clayton (W-DE) | March 4, 1845 | Former senator (7 years) |
| 31 | Thomas Corwin (W-OH) | March 4, 1845 | Former representative (9 years) |
| 32 | Jesse Speight (D-MS) | March 4, 1845 | Former representative (8 years) |
| 33 | Hopkins Lacy Turney (D-TN) | March 4, 1845 | Former representative (6 years) |
| 34 | Lewis Cass (D-MI) | March 4, 1845 | Former cabinet member |
| 35 | Jesse D. Bright (D-IN) | March 4, 1845 | Indiana 10th in population (1840) |
| 36 | Reverdy Johnson (W-MD) | March 4, 1845 | Maryland 15th in population (1840) |
| 37 | Albert Collins Greene (W-RI) | March 4, 1845 | Rhode Island 24th in population (1840) |
| 38 | Simon Cameron (D-PA) | March 13, 1845 |
| 39 | John Davis (W-MA) | March 24, 1845 |
| 40 | David Levy Yulee (D-FL) | July 1, 1845 | Former delegate |
| 41 | John Caldwell Calhoun (D-SC) | November 26, 1845 |
| 42 | Thomas Jefferson Rusk (D-TX) | February 21, 1846 | |
| 43 | Samuel Houston (D-TX) | February 26, 1846 | Former representative |
| 44 | George Edmund Badger (W-NC) | November 25, 1846 |
| 45 | Andrew Pickens Butler (D-SC) | December 4, 1846 |
| 46 | James M. Mason (D-VA) | January 21, 1847 | Former representative |
| 47 | Robert M. T. Hunter (D-VA) | March 4, 1847 | Former representative (8 years); Virginia 4th in population (1840) |
| 48 | Joseph Rogers Underwood (W-KY) | March 4, 1847 | Former representative (8 years); Kentucky 6th in population (1840) |
| 49 | Stephen A. Douglas (D-IL) | March 4, 1847 | Former representative (4 years) |
| 50 | John P. Hale (D-NH) | March 4, 1847 | Former representative (2 years) |
| 51 | Alpheus Felch (D-MI) | March 4, 1847 | Former governor |
| 52 | James Ware Bradbury (D-ME) | March 4, 1847 | Maine 13th in population (1840) |
| 53 | Henry Stuart Foote (D-MS) | March 4, 1847 | Mississippi 17th in population (1840) |
| 54 | Solomon Weathersbee Downs (D-LA) | March 4, 1847 | Louisiana 19th in population (1840) |
| 55 | John Hopkins Clarke (W-RI) | March 4, 1847 | Rhode Island 24th in population (1840) |
| 56 | Presley Spruance (W-DE) | March 4, 1847 | Delaware 26th in population (1840) |
| | Jefferson Davis (D-MS) | March 4, 1847 | August 10, 1847 |
| | Roger Sherman Baldwin (W-CT) | November 11, 1847 |
| | John Bell (W-TN) | November 22, 1847 |
| | Wyman Bradbury Seavy Moor (D-ME) | January 5, 1848 |
| | Herschel Vespasian Johnson (D-GA) | February 5, 1848 |
| | Solon Borland (D-AR) | March 30, 1848 |
| | William K. Sebastian (D-AR) | May 12, 1848 |
| | Hannibal Hamlin (D-ME) | June 8, 1848 | Former representative (4 years); Maine 13th in population (1840) |
| | Henry Dodge (D-WI) | June 8, 1848 | Former delegate (4 years); Wisconsin 28th in population (1840) |
| | Thomas Fitzgerald (D-MI) | June 8, 1848 | |
| | Isaac Pigeon Walker (D-WI) | June 8, 1848 | Wisconsin 28th in population (1840) |
| | Thomas Metcalfe (D-KY) | June 23, 1848 |
| | William Rufus de Vane King (D-AL) | July 1, 1848 |
| | Benjamin Fitzpatrick (D-AL) | November 25, 1848 |
| | Augustus Caesar Dodge (D-IA) | December 7, 1848 | Former delegate (6 years) |
| | George Wallace Jones (D-IA) | December 7, 1848 | Former delegate (3 years) |
| | John Wales (W-DE) | February 23, 1849 |