| | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- | | Edward M. Irwin | | Republican | 1924 | Incumbent re-elected. | nowrap | |- | | William W. Arnold | | Democratic | 1922 | Incumbent re-elected. | nowrap | |- | | Thomas Sutler Williams | | Republican | 1914 | Incumbent re-elected. | nowrap | |- | | Edward E. Denison | | Republican | 1914 | Incumbent re-elected. | nowrap | |- | | Richard Yates Jr. | | Republican | 1918 | Incumbent re-elected. | rowspan=2 nowrap | |- | | Henry R. Rathbone | | Republican | 1922 | Incumbent re-elected. |} Indiana |- | | Harry E. Rowbottom | | Republican | 1924 | Incumbent re-elected. | nowrap | |- | | Arthur H. Greenwood | | Democratic | 1922 | Incumbent re-elected. | nowrap | |- | | Frank Gardner | | Democratic | 1922 | Incumbent re-elected. | nowrap | |- | | Harry C. Canfield | | Democratic | 1922 | Incumbent re-elected. | nowrap | |- | | Noble J. Johnson | | Republican | 1924 | Incumbent re-elected. | nowrap | |- | | Richard N. Elliott | | Republican | 1918 | Incumbent re-elected. | nowrap | |- | | Ralph E. Updike | | Republican | 1924 | Incumbent re-elected. | nowrap | |- | | Albert H. Vestal | | Republican | 1916 | Incumbent re-elected. | nowrap | |- | | Fred S. Purnell | | Republican | 1916 | Incumbent re-elected. | nowrap | |- | | William R. Wood | | Republican | 1914 | Incumbent re-elected. | nowrap | |- | | Albert R. Hall | | Republican | 1924 | Incumbent re-elected. | nowrap | |- | | David Hogg | | Republican | 1924 | Incumbent re-elected. | nowrap | |- | | Andrew J. Hickey | | Republican | 1918 | Incumbent re-elected. | nowrap | |} Iowa |- | | William F. Kopp | | Republican | 1920 | Incumbent re-elected. | nowrap | |- | | F. Dickinson Letts | | Republican | 1924 | Incumbent re-elected. | nowrap | |- | | Thomas J. B. Robinson | | Republican | 1922 | Incumbent re-elected. | nowrap | |- | | Gilbert N. Haugen | | Republican | 1898 | Incumbent re-elected.