Roger H. Zion | | Republican | 1966 | Incumbent re-elected. | nowrap | |- ! | Lee H. Hamilton | | Democratic | 1964 | Incumbent re-elected. | nowrap | |- ! | David W. Dennis | | Republican | 1968 | Incumbent re-elected. | nowrap | |- ! | Andrew Jacobs Jr. | | Democratic | 1964 | | Incumbent lost re-election.New member elected.Republican gain. | nowrap | |} Iowa Iowa was reapportioned from 7 seats to 6, dividing the old around Des Moines between its neighbors. Its incumbent, Neal Smith, won again in the south-central Iowa . |- ! | Fred Schwengel | | Republican | 19541964 1966 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | John C. Culver | | Democratic | 1964 | Incumbent re-elected. | nowrap | |- ! | H. R. Gross | | Republican | 1948 | Incumbent re-elected. | nowrap | |- ! rowspan=2 | | John Henry Kyl | | Republican | 1959 1964 1966 | | Incumbent lost re-election.Republican loss. | rowspan=2 nowrap | |- | Neal Smith | | Democratic | 1958 | Incumbent re-elected. |- ! | William J. Scherle | | Republican | 1966 | Incumbent re-elected. | nowrap | |- ! | Wiley Mayne | | Republican | 1966 | Incumbent re-elected. | nowrap | |} Kansas |- ! | Keith Sebelius | | Republican | 1968 | Incumbent re-elected. | nowrap | |- ! | William R. Roy | | Democratic | 1970 | Incumbent re-elected. | 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 re-elected. | nowrap | |- ! | William Natcher | | Democratic | 1953 | Incumbent re-elected. | nowrap | |- ! | Romano 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 | |- ! | William P. Curlin