Columns: District | Vacator | Reason for change | Successor | Date successor seated
Georgia 3rd | Vacant | Rep-elect Washington Poe declined the seat | George W. Towns ( D ) | Seated January 5, 1846 | New Jersey 2nd | Samuel G. Wright ( W ) | Died July 30, 1845 | George Sykes ( D ) | Seated November 4, 1845 | Tennessee 8th | Joseph H. Peyton ( W ) | Died November 11, 1845 | Edwin H. Ewing ( W ) | Seated ?????? | Virginia 11th | William Taylor ( D ) | Died January 17, 1846 | James McDowell ( D ) | Seated March 6, 1846 | Florida At-large | Edward C. Cabell ( W ) | Lost contested election January 24, 1846 | William H. Brockenbrough ( D ) | Seated January 24, 1846 | New York 12th | Richard P. Herrick ( W ) | Died June 20, 1846 | Thomas C. Ripley ( W ) | Seated December 17, 1846 | Alabama 3rd | William L. Yancey ( D ) | Resigned September 1, 1846 | James L. Cottrell ( D ) | Seated December 7, 1846 | Alabama 7th | Felix G. McConnell ( D ) | Died September 10, 1846 | Franklin W. Bowdon ( D ) | Seated December 7, 1846 | Iowa At-large | Iowa admitted into the Union December 28, 1846 | Iowa admitted into the Union December 28, 1846 | S. Clinton Hastings ( D ) | Seated December 28, 1846