nowrap | |} North Dakota |- ! | Mark Andrews | | Republican | 1963 | Incumbent re-elected. | nowrap | |- ! | Thomas S. Kleppe | | Republican | 1966 | | Incumbent retired to run for U.S. senator.New member elected.Democratic gain. | nowrap | |} Ohio |- ! | Robert Taft Jr. | | Republican | 19621964 1966 | | Incumbent retired to run for U.S. senator.New member elected.Republican hold. | nowrap | |- ! | Donald D. Clancy | | Republican | 1960 | Incumbent re-elected. | nowrap | |- ! | Charles W. Whalen Jr. | | Republican | 1966 | Incumbent re-elected. | nowrap | |- ! | William Moore McCulloch | | Republican | 1947 | 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 | |- ! | Jackson Edward Betts | | Republican | 1950 | 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 re-elected. | nowrap | |- ! | William Hanes Ayres | | Republican | 1950 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | Chalmers Wylie | | Republican | 1966 | Incumbent re-elected. | nowrap | |- ! | Frank T. Bow | | Republican | 1950 | Incumbent re-elected. | nowrap | |- ! | John M. Ashbrook | | Republican | 1960 | Incumbent re-elected. | nowrap | |- ! | Wayne Hays | | Democratic | 1948 | Incumbent re-elected. | nowrap | |- ! | Michael J. Kirwan | | Democratic | 1936 | | Incumbent died.New member elected.Democratic hold. | nowrap | |- ! | Michael A. Feighan | | Democratic | 1942 | |