Republican | 1962 | Incumbent re-elected. | nowrap | |- ! | Roy A. Taylor | | Democratic | 1960 | | Incumbent retired.New member elected.Democratic hold. | nowrap | |} North Dakota |- ! | Mark Andrews | | Republican | 1963 | Incumbent re-elected. | nowrap | |} Ohio |- ! | Bill Gradison | | Republican | 1974 | Incumbent re-elected. | nowrap | |- ! | Donald D. Clancy | | Republican | 1960 | | Lost re-electionDemocratic gain. | nowrap | |- ! | Charles W. Whalen Jr. | | Republican | 1966 | Incumbent re-elected. | nowrap | |- ! | Tennyson Guyer | | Republican | 1972 | Incumbent re-elected. | nowrap | |- ! | Del Latta | | Republican | 1958 | Incumbent re-elected. | nowrap | |- ! | Bill Harsha | | Republican | 1960 | Incumbent re-elected. | nowrap | |- ! | Bud Brown | | Republican | 1965 | Incumbent re-elected. | nowrap | |- ! | Tom Kindness | | Republican | 1974 | Incumbent re-elected. | nowrap | |- ! | Thomas L. Ashley | | Democratic | 1954 | Incumbent re-elected. | nowrap | |- ! | Clarence E. Miller | | Republican | 1966 | Incumbent re-elected. | nowrap | |- ! | J. William Stanton | | Republican | 1964 | Incumbent re-elected. | nowrap | |- ! | Samuel L. Devine | | Republican | 1958 | Incumbent re-elected. | nowrap | |- ! | Charles Adams Mosher | | Republican | 1960 | | Incumbent retired.New member elected.Democratic gain. | nowrap | |- ! | John F. Seiberling | | Democratic | 1970 | Incumbent re-elected. | nowrap | |- ! | Chalmers Wylie | | Republican | 1966 | Incumbent re-elected. | nowrap | |- ! | Ralph Regula | | Republican | 1972 | Incumbent re-elected. | nowrap | |- ! | John M. Ashbrook | | Republican | 1960 | Incumbent re-elected. | nowrap | |- ! | Wayne Hays | | Democratic | 1948 | | Incumbent resigned.New member elected.Democratic hold. | nowrap | |- ! | Charles J. Carney | | Democratic | 1970 | Incumbent re-elected. | nowrap | |- ! | James V. Stanton | | Democratic | 1970 | | Incumbent retired to run for U.S. senator.New member elected.Democratic hold. |