| William Broomfield | | Republican | 1956 | Incumbent re-elected. | nowrap | |- ! | Billie S. Farnum | | Democratic | 1964 | | Incumbent lost re-election.New member elected.Republican gain. | nowrap | |} Minnesota |- ! | Al Quie | | Republican | 1958 | Incumbent re-elected. | nowrap | |- ! | Ancher Nelsen | | Republican | 1958 | Incumbent re-elected. | nowrap | |- ! | Clark MacGregor | | Republican | 1960 | Incumbent re-elected. | nowrap | |- ! | Joseph Karth | | Democratic | 1958 | Incumbent re-elected. | nowrap | |- ! | Donald M. Fraser | | Democratic | 1962 | Incumbent re-elected. | nowrap | |- ! | Alec G. Olson | | Democratic | 1962 | | Incumbent lost re-election.New member elected.Republican gain. | nowrap | |- ! | Odin Langen | | Republican | 1958 | Incumbent re-elected. | nowrap | |- ! | John Blatnik | | Democratic | 1946 | Incumbent re-elected. | nowrap | |} Mississippi |- ! | Thomas Abernethy | | Democratic | 1942 | Incumbent re-elected. | nowrap | |- ! | Jamie Whitten | | Democratic | 1941 | Incumbent re-elected. | nowrap | |- ! | John Bell Williams | | Democratic | 1946 | Incumbent re-elected. | nowrap | |- ! | Prentiss Walker | | Republican | 1964 | | Incumbent retired to run for U.S. Senator.New member elected.Democratic gain. | nowrap | |- ! | William M. Colmer | | Democratic | 1932 | Incumbent re-elected. | nowrap | |} Missouri |- ! | Frank M. Karsten | | Democratic | 1946 | Incumbent re-elected. | nowrap | |- ! | Thomas B. Curtis | | Republican | 1950 | Incumbent re-elected. | nowrap | |- ! | Leonor Sullivan | | Democratic | 1952 | Incumbent re-elected. | nowrap | |- ! | William J. Randall | | Democratic | 1959 | Incumbent re-elected. | nowrap | |- ! | Richard Walker Bolling | | Democratic | 1948 | Incumbent re-elected. | nowrap | |- ! | William Raleigh Hull Jr. | | Democratic | 1954 | Incumbent re-elected. | nowrap | |- ! | Durward Gorham Hall | | Republican | 1960 | Incumbent re-elected. | nowrap | |- ! | Richard Howard Ichord Jr. | | Democratic | 1960 |