November 8, 1910.Republican hold. | nowrap | |- ! |} Alabama Arkansas California Colorado Connecticut Delaware Florida Georgia Idaho |- ! | Thomas R. Hamer | | Republican | 1908 | | Incumbent lost renomination.New member elected.Republican hold. | nowrap | |} Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts |- ! | George P. Lawrence | | Republican | 1897 (special) | Incumbent re-elected. | nowrap | |- ! | Frederick H. Gillett | | Republican | 1892 | Incumbent re-elected. | nowrap | |- ! | Charles G. Washburn | | Republican | 1906 (special) | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | colspan="3" | Vacant | | Incumbent died July 31, 1910.New member elected.Republican hold. | nowrap | |- ! | Butler Ames | | Republican | 1902 | Incumbent re-elected. | nowrap | |- ! | Augustus Peabody Gardner | | Republican | 1902 (special) | Incumbent re-elected. | nowrap | |- ! | Ernest W. Roberts | | Republican | 1898 | Incumbent re-elected. | nowrap | |- ! | Samuel W. McCall | | Republican | 1892 | Incumbent re-elected. | nowrap | |- ! | John A. Keliher | | Democratic | 1902 | | Incumbent lost re-nomination.New member elected.Democratic hold. | nowrap | |- ! | Joseph F. O'Connell | | Democratic | 1906 | | Incumbent lost re-nomination.New member elected.Democratic hold. | nowrap | |- ! | Andrew James Peters | | Democratic | 1906 | Incumbent re-elected. | nowrap | |- ! | John W. Weeks | | Republican | 1904 | Incumbent re-elected. | nowrap | |- ! | William S. Greene | | Republican | 1898 (special) | Incumbent re-elected. | nowrap | |- ! | Eugene Foss | | Democratic | 1910 (special) | | Incumbent retired to run for Governor of Massachusetts.New member elected.Republican gain. | nowrap | |} Michigan Minnesota Mississippi |- ! | Ezekiel S. Candler Jr. | | Democratic | 1900 | Incumbent re-elected. | nowrap | |- ! | Thomas Spight | | Democratic | 1898 (special) | | Incumbent lost renomination.New member elected.Democratic hold. | nowrap | |- ! | Benjamin G. Humphreys II | | Democratic | 1902 | Incumbent re-elected. | nowrap | |- ! | Thomas U. Sisson | | Democratic | 1908 | Incumbent re-elected. | nowrap | |- !