|} Louisiana |- ! | F. Edward Hébert | | Democratic | 1940 | Incumbent re-elected. | nowrap | |- ! | Lindy Boggs | | Democratic | 1973 | Incumbent re-elected. | nowrap | |- ! | Dave Treen | | Republican | 1972 | Incumbent re-elected. | nowrap | |- ! | Joe Waggonner | | Democratic | 1961 | Incumbent re-elected. | nowrap | |- ! | Otto Passman | | Democratic | 1946 | Incumbent re-elected. | nowrap | |- ! | John Rarick | | Democratic | 1966 | | Incumbent lost renomination.New member elected.Republican gain. | nowrap | |- ! | John Breaux | | Democratic | 1972 | Incumbent re-elected. | nowrap | |- ! | Gillis William Long | | Democratic | 19621964 1972 | Incumbent re-elected. | nowrap | |} Maine |- ! | Peter N. Kyros | | Democratic | 1966 | | Incumbent lost re-election.New member elected.Republican gain. | nowrap | |- ! | William Cohen | | Republican | 1972 | Incumbent re-elected. | nowrap | |} Maryland |- ! | Robert Bauman | | Republican | 1973 | Incumbent re-elected. | nowrap | |- ! | Clarence Long | | Democratic | 1962 | Incumbent re-elected. | nowrap | |- ! | Paul Sarbanes | | Democratic | 1970 | Incumbent re-elected. | nowrap | |- ! | Marjorie Holt | | Republican | 1972 | Incumbent re-elected. | nowrap | |- ! | Lawrence Hogan | | Republican | 1968 | | Incumbent retired to run for Governor of Maryland.New member elected.Democratic gain. | nowrap | |- ! | Goodloe Byron | | Democratic | 1970 | Incumbent re-elected. | nowrap | |- ! | Parren Mitchell | | Democratic | 1970 | Incumbent re-elected. | nowrap | |- ! | Gilbert Gude | | Republican | 1966 | Incumbent re-elected. | nowrap | |} Massachusetts |- ! | Silvio Conte | | Republican | 1958 | Incumbent re-elected. | nowrap | |- ! | Edward Boland | | Democratic | 1952 | Incumbent re-elected. | nowrap | |- ! | Harold Donohue | | Democratic | 1946 | | Incumbent retired.New member elected.Democratic hold. | nowrap | |- ! | Robert Drinan | | Democratic | 1970 | Incumbent re-elected. | nowrap | |- ! | Paul W. Cronin | | Republican | 1972 |