| Richard T. Hanna | | Democratic | 1962 | Incumbent re-elected. | nowrap | |- ! | John G. Schmitz | | Republican | 1970 | Incumbent re-elected. | nowrap | |- ! | Bob Wilson | | Republican | 1952 | Incumbent re-elected. | nowrap | |- ! | Lionel Van Deerlin | | Democratic | 1962 | Incumbent re-elected. | nowrap | |- ! | John V. Tunney | | Democratic | 1964 | | Incumbent retired to run for U.S. senator.New member elected.Republican gain. | nowrap | |} Colorado |- ! | Byron G. Rogers | | Democratic | 1950 | | Incumbent lost renomination.New member elected.Republican gain. | nowrap | |- ! | Donald G. Brotzman | | Republican | 19621964 1966 | Incumbent re-elected. | nowrap | |- ! | Frank Evans | | Democratic | 1964 | Incumbent re-elected. | nowrap | |- ! | Wayne N. Aspinall | | Democratic | 1948 | Incumbent re-elected. | nowrap | |} Connecticut |- ! | Emilio Q. Daddario | | Democratic | 1958 | | Incumbent retired to run for Governor of Connecticut.New member elected.Democratic hold. | nowrap | |- ! | William St. Onge | | Democratic | 1962 | | Incumbent died.New member elected.Republican gain. | nowrap | |- ! | Robert Giaimo | | Democratic | 1958 | Incumbent re-elected. | nowrap | |- ! | Lowell Weicker | | Republican | 1968 | | Incumbent retired to run for U.S. senator.New member elected.Republican hold. | nowrap | |- ! | John S. Monagan | | Democratic | 1958 | Incumbent re-elected. | nowrap | |- ! | Thomas Meskill | | Republican | 1966 | | Incumbent retired to run for Governor of Connecticut.New member elected.Democratic gain. | nowrap | |} Delaware |- ! | William Roth | | Republican | 1966 | | Incumbent retired to run for U.S. senator.New member elected.Republican hold. | nowrap | |} Florida |- ! | Bob Sikes | | Democratic | 19401944 1974 | Incumbent re-elected. | nowrap | |- ! | Don Fuqua | | Democratic | 1962 | Incumbent re-elected. | nowrap | |- ! | Charles E. Bennett | | Democratic | 1948 | Incumbent re-elected. | nowrap | |- ! | Bill Chappell | | Democratic | 1968 | Incumbent re-elected. | nowrap | |- ! | Louis Frey