|- ! | George Grundy Dunn | | People's | 1854 | | Incumbent retired.New member elected.Democratic gain. | nowrap | |- ! | William Cumback | | People's | 1854 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | David P. Holloway | | People's | 1854 | | Incumbent retired.New member elected.Republican gain. | nowrap | |- ! | Lucien Barbour | | People's | 1854 | | Incumbent retired.New member elected.Democratic gain. | nowrap | |- ! | Harvey D. Scott | | People's | 1854 | | Incumbent retired.New member elected.Democratic gain. | nowrap | |- ! | Daniel Mace | | People's | 1851 | | Incumbent retired.New member elected.Republican gain. | nowrap | |- ! | Schuyler Colfax | | People's | 1854 | | Incumbent re-elected to a new party.Republican gain. | nowrap | |- ! | Samuel Brenton | | People's | 1854 | | Incumbent re-elected to a new party.Republican gain. | nowrap | |- ! | John U. Pettit | | People's | 1854 | | Incumbent re-elected to a new party.Republican gain. | nowrap | |} Iowa |- ! | Augustus Hall | | Democratic | 1854 | | Incumbent lost re-election.New member elected.Republican gain. | nowrap | |- ! | James Thorington | | Whig | 1854 | | Incumbent lost renomination.New member elected.Republican gain. | nowrap | |} Kansas Territory See non-voting delegates, below. Kentucky |- ! | Henry Cornelius Burnett | | Democratic | 1855 | Incumbent re-elected. | nowrap | |- ! | John P. Campbell Jr. | | Know Nothing | 1855 | | Incumbent withdrew.New member elected.Democratic gain. | nowrap | |- ! | Warner Underwood | | Know Nothing | 1855 | Incumbent re-elected. | nowrap | |- ! | Albert G. Talbott | | Democratic | 1855 | Incumbent re-elected. | nowrap | |- ! | Joshua Jewett | | Democratic | 1855 | Incumbent re-elected. | nowrap | |- ! | John Milton Elliott | | Democratic | 1853 | Incumbent re-elected. | nowrap | |- ! | Humphrey Marshall | | Know Nothing | 1855 | Incumbent re-elected. | nowrap | |- ! | Alexander Keith Marshall | | Know Nothing | 1855 | | Incumbent retired.New member elected.Democratic gain. | nowrap | |- ! | Leander Cox | | Know Nothing | 1853