Columns: District | Vacator | Reason for change | Successor | Date successor seated
Indiana Territory | Vacant | failure to elect | Jonathan Jennings | Seated November 27, 1809 | Pennsylvania 1st | Benjamin Say (DR) | Resigned June, 1809 | Adam Seybert (DR) | Seated October 10, 1809 | Massachusetts 7th | William Baylies (F) | Lost contested election June 28, 1809 | Charles Turner, Jr. (DR) | June 28, 1809 | Virginia 21st | Wilson C. Nicholas (DR) | Resigned November 27, 1809 | David S. Garland (DR) | Seated January 17, 1810 | Maryland 7th | John Brown (DR) | Resigned sometime in 1810 | Robert Wright (DR) | Seated November 29, 1810 | Massachusetts 10th | Jabez Upham (F) | Resigned sometime in 1810 | Joseph Allen (F) | October 8, 1810 | New York 2nd | William Denning (DR) | Resigned sometime in 1810 | Samuel L. Mitchill (DR) | December 4, 1810 | Maryland 4th | Roger Nelson (DR) | Resigned May 14, 1810 | Samuel Ringgold (DR) | Seated October 15, 1810 | Massachusetts 11th | William Stedman (F) | Resigned July 16, 1810 | Abijah Bigelow (F) | October 8, 1810 | New Jersey At-large | James Cox (DR) | Died September 12, 1810 | John A. Scudder (DR) | Seated October 31, 1810 | Virginia 1st | John G. Jackson (DR) | Resigned September 28, 1810 | William McKinley (DR) | Seated December 21, 1810