| Republican | 1966 | Incumbent re-elected. | nowrap | |- ! | Elford Albin Cederberg | | Republican | 1952 | Incumbent re-elected. | nowrap | |- ! | Philip Ruppe | | Republican | 1966 | Incumbent re-elected. | nowrap | |- ! | James G. O'Hara | | Democratic | 1958 | Incumbent re-elected. | nowrap | |- ! | Charles Diggs | | Democratic | 1954 | Incumbent re-elected. | nowrap | |- ! | Lucien Nedzi | | Democratic | 1961 | Incumbent re-elected. | nowrap | |- ! | William D. Ford | | Democratic | 1964 | Incumbent re-elected. | nowrap | |- ! | John D. Dingell Jr. | | Democratic | 1955 | Incumbent re-elected. | nowrap | |- ! | Martha Griffiths | | Democratic | 1954 | Incumbent re-elected. | nowrap | |- ! | William Broomfield | | Republican | 1956 | Incumbent re-elected. | nowrap | |- ! | Jack H. McDonald | | Republican | 1966 | Incumbent re-elected. | nowrap | |} Minnesota |- ! | Al Quie | | Republican | 1958 | Incumbent re-elected. | nowrap | |- ! | Ancher Nelsen | | Republican | 1958 | Incumbent re-elected. | nowrap | |- ! | Clark MacGregor | | Republican | 1960 | | Incumbent retired to run for U.S. senator.New member elected.Republican hold. | nowrap | |- ! | Joseph Karth | | | 1958 | Incumbent re-elected. | nowrap | |- ! | Donald M. Fraser | | | 1962 | Incumbent re-elected. | nowrap | |- ! | John M. Zwach | | Republican | 1966 | Incumbent re-elected. | nowrap | |- ! | Odin Langen | | Republican | 1958 | | Incumbent lost re-election.New member elected. gain. | nowrap | |- ! | John Blatnik | | | 1946 | Incumbent re-elected. | nowrap | |} Mississippi |- ! | Thomas Abernethy | | Democratic | 1942 | Incumbent re-elected. | nowrap | |- ! | Jamie Whitten | | Democratic | 1941 | Incumbent re-elected. | nowrap | |- ! | Charles H. Griffin | | Democratic | 1968 | Incumbent re-elected. | nowrap | |- ! | Sonny Montgomery | | Democratic | 1966 | Incumbent re-elected. | nowrap | |- ! | William M. Colmer | | Democratic | 1932 | Incumbent re-elected.