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 | |- ! | Walter H. Moeller | | Democratic | 1964 | | Incumbent lost re-election.New member elected.Republican gain. | 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 re-elected. | nowrap | |- ! | colspan=3 | None (District created) | | New seat.New member elected.Republican gain. | nowrap | |- ! | Frank T. Bow | | Republican | 1950 | Incumbent re-elected. | nowrap | |- ! rowspan=2 | | John M. Ashbrook | | Republican | 1960 | Incumbent re-elected. | rowspan=2 nowrap | |- | Robert T. Secrest | | Democratic | 1962 | | Incumbent lost re-election.Democratic loss. |- ! | Wayne Hays | | Democratic | 1948 | Incumbent re-elected. | nowrap | |- ! | Michael J. Kirwan | | Democratic | 1936 | Incumbent re-elected. | nowrap | |- ! | Michael A. Feighan | | Democratic | 1942 | Incumbent re-elected. | nowrap | |- ! | Charles Vanik | | Democratic | 1954 | Incumbent re-elected. | nowrap | |- ! | Frances P. Bolton | | Republican | 1940 | Incumbent re-elected. | nowrap | |- ! | William Edwin Minshall Jr. | | Republican | 1954 | Incumbent re-elected. | nowrap | |- ! | Robert E. Sweeney | | Democratic | 1964 | | Incumbent retired.New member elected.Republican gain. | nowrap | |} Oklahoma |- ! | Page Belcher | | Republican | 1950 | Incumbent re-elected. | nowrap | |- ! | Ed Edmondson | | Democratic | 1952 | Incumbent re-elected. | nowrap | |- ! | Carl Albert | | Democratic | 1946 | Incumbent re-elected. | nowrap | |- ! | Tom Steed | | Democratic | 1948 | Incumbent re-elected. | nowrap | |- ! | John Jarman