Lee H. Hamilton | | Democratic | 1964 | Incumbent re-elected. | nowrap | |- ! | David W. Dennis | | Republican | 1968 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | William H. Hudnut III | | Republican | 1972 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |} Iowa |- ! | Edward Mezvinsky | | Democratic | 1972 | Incumbent re-elected. | nowrap | |- ! | John C. Culver | | Democratic | 1964 | | Incumbent retired to run for U.S. senator.New member elected.Democratic hold. | nowrap | |- ! | H. R. Gross | | Republican | 1948 | | Incumbent retired.New member elected.Republican hold. | nowrap | |- ! | Neal Smith | | Democratic | 1958 | Incumbent re-elected. | nowrap | |- ! | William J. Scherle | | Republican | 1966 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | Wiley Mayne | | Republican | 1966 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |} Kansas |- ! | Keith Sebelius | | Republican | 1968 | Incumbent re-elected. | nowrap | |- ! | William R. Roy | | Democratic | 1970 | | Incumbent retired to run for U.S. senator.New member elected.Democratic hold. | nowrap | |- ! | Larry Winn | | Republican | 1966 | Incumbent re-elected. | nowrap | |- ! | Garner E. Shriver | | Republican | 1960 | Incumbent re-elected. | nowrap | |- ! | Joe Skubitz | | Republican | 1962 | Incumbent re-elected. | nowrap | |} Kentucky |- ! | Frank Stubblefield | | Democratic | 1958 | | Incumbent lost renomination.New member elected.Democratic hold. | nowrap | |- ! | William Natcher | | Democratic | 1953 | Incumbent re-elected. | nowrap | |- ! | Romano L. Mazzoli | | Democratic | 1970 | Incumbent re-elected. | nowrap | |- ! | Gene Snyder | | Republican | 19621964 1966 | Incumbent re-elected. | nowrap | |- ! | Tim Lee Carter | | Republican | 1964 | Incumbent re-elected. | nowrap | |- ! | John B. Breckinridge | | Democratic | 1972 | Incumbent re-elected. | nowrap | |- ! | Carl D. Perkins | | Democratic | 1948 | Incumbent re-elected. | nowrap |