25, 1826.New member elected October 10, 1826.Anti-Jacksonian hold.Successor was seated December 4, 1826.Successor was not a candidate on the same day for the next term, see below. | nowrap | |- ! | Joseph Hemphill | | Jacksonian | 18001802 1818 | | Incumbent resigned before October 10, 1826.New member elected October 10, 1826.Anti-Jacksonian gain.Successor was seated December 4, 1826.Successor lost election the same day to the next term, see below. | nowrap | |- ! | Henry Wilson | | Jacksonian | 1822 | | Incumbent died August 14, 1826.New member elected October 10, 1826.Jacksonian hold.Successor was seated December 4, 1826.Successor was not elected the same day to the next term, see below. | nowrap | |- ! | Alexander Thomson | | Jacksonian | 1824 | | Incumbent resigned May 1, 1826.New member elected October 10, 1826.Jacksonian hold.Successor was seated December 4, 1826.Successor also elected the same day to the next term, see below. | nowrap | |- ! | Willie P. Mangum | | Jacksonian | 1823 | | Incumbent resigned March 18, 1826.New member elected November 3, 1826.Jacksonian hold.Successor was seated December 4, 1826.Successor was later re-elected to the next term, see below. | nowrap | |- ! | James Johnson | | Jacksonian | 1824 | | Incumbent died August 13, 1826.New member elected November 6, 1826.Jacksonian hold.Successor was seated December 7, 1826.Successor was later re-elected to the next term, see below. | nowrap | |- ! | Robert P. Henry | | Jacksonian | 1822 | | Incumbent died August 25, 1826.New member elected November 20, 1826.Anti-Jacksonian gain.Successor was seated December 11, 1826.Successor later lost re-election to the next term, see below. | nowrap | |- ! | Enoch Lincoln | | Anti-Jacksonian | 1818 | | Incumbent resigned in January 1826.New member elected November 27, 1826 on the second ballot.Jacksonian gain.Successor was seated December 4, 1826.Successor had already been elected to the next term, see below. | nowrap | |} 20th Congress |- ! | Daniel Webster | | Anti-Jacksonian | 18121816 1822 | | Incumbent resigned May 30, 1827 to run for U.S. Senator.New member elected July 23, 1827.Anti-Jacksonian hold.Successor was seated December 3, 1827. | nowrap | |- ! | William Burleigh | | Anti-Jacksonian | 1823 | | Incumbent died July 2, 1827.New member elected September 27, 1827.Jacksonian gain.Successor was seated December 3, 1827. | nowrap | |- ! |