| | Democratic | 1930 | Incumbent re-elected. | nowrap | |- ! | Eugene B. Crowe | | Democratic | 1930 | | Incumbent lost re-election.New member elected.Republican gain. | nowrap | |- ! | Raymond S. Springer | | Republican | 1938 | Incumbent re-elected. | nowrap | |- ! | William Larrabee | | Democratic | 1930 | Incumbent re-elected. | nowrap | |- ! | Louis Ludlow | | Democratic | 1928 | Incumbent re-elected. | nowrap | |} Iowa |- ! | Thomas E. Martin | | Republican | 1938 | Incumbent re-elected. | nowrap | |- ! | William S. Jacobsen | | Democratic | 1936 | Incumbent re-elected. | nowrap | |- ! | John W. Gwynne | | Republican | 1934 | Incumbent re-elected. | nowrap | |- ! | Henry O. Talle | | Republican | 1938 | Incumbent re-elected. | nowrap | |- ! | Karl M. LeCompte | | Republican | 1938 | Incumbent re-elected. | nowrap | |- ! | Robert K. Goodwin | | Republican | 1940 | | Incumbent retired.New member elected.Republican hold. | nowrap | |- ! | Ben F. Jensen | | Republican | 1938 | Incumbent re-elected. | nowrap | |- ! | Fred C. Gilchrist | | Republican | 1930 | Incumbent re-elected. | nowrap | |- ! | Vincent F. Harrington | | Democratic | 1936 | Incumbent re-elected. | nowrap | |} Kansas |- ! | William P. Lambertson | | Republican | 1928 | Incumbent re-elected. | nowrap | |- ! | Ulysses Samuel Guyer | | Republican | 1926 | Incumbent re-elected. | nowrap | |- ! | Thomas Daniel Winter | | Republican | 1938 | Incumbent re-elected. | nowrap | |- ! | Edward Herbert Rees | | Republican | 1936 | Incumbent re-elected. | nowrap | |- ! | John Mills Houston | | Democratic | 1934 | Incumbent re-elected. | nowrap | |- ! | Frank Carlson | | Republican | 1934 | Incumbent re-elected. | nowrap | |- ! | Clifford R. Hope | | Republican | 1926 | Incumbent re-elected. | nowrap | |} Kentucky |- ! | Noble Jones Gregory | | Democratic | 1936 | Incumbent re-elected. | nowrap | |- ! | Beverly M. Vincent | | Democratic | 1937 | Incumbent re-elected. | nowrap | |- ! |