Democrat | 1910 | Incumbent re-elected. | nowrap | |- ! | Thomas M. Bell | | Democratic | 1904 | Incumbent re-elected. | nowrap | |- ! | Thomas W. Hardwick | | Democratic | 1902 | Incumbent re-elected. | nowrap | |- ! | William G. Brantley | | Democratic | 1896 | | Incumbent retired.New member elected.Democratic Hold | nowrap | |- ! | colspan=3 | None (District Created) | | New member elected.Democratic gain. | nowrap | |} Idaho |- ! rowspan=2 | | Burton L. French | | Republican | nowrap | 1910 | Incumbent re-elected. | nowrap rowspan=2 | |- | colspan=3 | New seat | | New member elected.Republican gain. |} Illinois |- ! | Martin B. Madden | | Republican | 1902 | Incumbent re-elected. | nowrap | |- ! | James Robert Mann | | Republican | 1896 | Incumbent re-elected. | nowrap | |- ! | William W. Wilson | | Republican | 1902 | | Incumbent lost re-election.Democratic gain. | nowrap | |- ! | James T. McDermott | | Democratic | 1906 | Incumbent re-elected. | nowrap | |- ! | Adolph J. Sabath | | Democratic | 1906 | Incumbent re-elected. | nowrap | |- ! | Edmund J. Stack | | Democratic | 1906 | | Incumbent lost renomination.New member elected.Democratic hold. | nowrap | |- ! | Frank Buchanan | | Democratic | 1906 | Incumbent re-elected. | nowrap | |- ! | Thomas Gallagher | | Democratic | 1908 | Incumbent re-elected. | nowrap | |- ! | Lynden Evans | | Democratic | 1910 | | Incumbent lost re-election.New member elected.Republican gain. | nowrap | |- ! | George Edmund Foss | | Republican | 1894 | | Incumbent lost re-election.New member elected.Progressive gain. | nowrap | |- ! | Ira C. Copley | | Republican | 1910 | Incumbent re-elected. | nowrap | |- ! | Charles E. Fuller | | Republican | 1902 | | Incumbent lost re-election.New member elected.Progressive gain. | nowrap | |- ! | John C. McKenzie | | Republican | 1910 | Incumbent re-elected. | nowrap | |- ! | James McKinney | | Republican | 1905 | | Incumbent retired.New member elected.Democratic gain. | nowrap | |- ! | George W. Prince | | Republican | 1895 | | Incumbent lost re-election.New member elected.Democratic gain. |