| 1908 | | Incumbent lost renomination.New member elected.Democratic hold. | nowrap | |- ! | Leonidas C. Dyer | | Democratic | 1910 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | Walter L. Hensley | | Democratic | 1910 | Incumbent re-elected. | nowrap | |- ! | Joseph J. Russell | | Democratic | 1904 | Incumbent re-elected. | nowrap | |- ! | James A. Daugherty | | Democratic | 1910 | | Incumbent lost re-nomination.New member elected.Democratic hold. | nowrap | |- ! | Thomas L. Rubey | | Democratic | 1908 | Incumbent re-elected. | nowrap | |} Montana |- ! rowspan=2 | | Charles N. Pray | | Republican | nowrap | 1906 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap rowspan=2 | |- | colspan=3 | New seat | | New member elected.Democratic gain. |} Nebraska |- ! | John A. Maguire | | Democratic | 1908 | Incumbent re-elected. | nowrap | |- ! | Charles O. Lobeck | | Democratic | 1910 | Incumbent re-elected. | nowrap | |- ! | Dan V. Stephens | | Democratic | 1911 (special) | Incumbent re-elected. | nowrap | |- ! | Charles H. Sloan | | Republican | 1910 | Incumbent re-elected. | nowrap | |- ! | George W. Norris | | Republican | 1902 | | Incumbent retired to run for U.S. senator.New member elected.Republican hold. | nowrap | |- ! | Moses Kinkaid | | Republican | 1902 | Incumbent re-elected. | nowrap | |} Nevada |- ! | Edwin E. Roberts | | Republican | 1910 | Incumbent re-elected. | nowrap | |} New Hampshire |- ! | Cyrus A. Sulloway | | Republican | 1894 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | Frank D. Currier | | Republican | 1900 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |} New Jersey |- ! | William J. Browning | | Republican | 1911 | Incumbent re-elected. | nowrap | |- ! | John J. Gardner | | Republican | 1892 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | Thomas J. Scully | | Democratic | 1910 | Incumbent re-elected. | nowrap | |- ! | Ira W. Wood | | Republican | 1904 | |