| Democratic | 1958 | Incumbent re-elected. | nowrap | |} North Carolina |- ! | Walter B. Jones Sr. | | Democratic | 1966 | Incumbent re-elected. | nowrap | |- ! | Lawrence H. Fountain | | Democratic | 1952 | Incumbent re-elected. | nowrap | |- ! | David N. Henderson | | Democratic | 1960 | Incumbent re-elected. | nowrap | |- ! | Harold D. Cooley | | Democratic | 1934 | | Incumbent lost re-election.New member elected.Republican gain. | nowrap | |- ! | Ralph James Scott | | Democratic | 1956 | | Incumbent retired.New member elected.Democratic hold. | nowrap | |- ! | Horace R. Kornegay | | Democratic | 1960 | Incumbent re-elected. | nowrap | |- ! | Alton Lennon | | Democratic | 1956 | Incumbent re-elected. | nowrap | |- ! | Charles R. Jonas | | Republican | 1952 | Incumbent re-elected. | nowrap | |- ! | Jim Broyhill | | Republican | 1962 | Incumbent re-elected. | nowrap | |- ! | Basil Lee Whitener | | Democratic | 1956 | Incumbent re-elected. | nowrap | |- ! | Roy A. Taylor | | Democratic | 1960 | Incumbent re-elected. | nowrap | |} North Dakota |- ! | Mark Andrews | | Republican | 1963 | Incumbent re-elected. | nowrap | |- ! | Rolland W. Redlin | | Democratic | 1964 | | Incumbent lost re-election.New member elected.Republican gain. | nowrap | |} Ohio Ohio redistricted its at-large seat into a 24th district, splitting out the counties to the southwest of Dayton from the city itself, as well as moving a district in southeastern Ohio into the Columbus area. |- ! | John J. Gilligan | | Democratic | 1964 | | Incumbent lost re-election.New member elected.Republican gain. | nowrap | |- ! | Donald D. Clancy | | Republican | 1960 | Incumbent re-elected. | nowrap | |- ! | Rodney M. Love | | Democratic | 1964 | | Incumbent lost re-election.New member elected.Republican gain. | 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