! | Edwin Reinecke | | Republican | 1964 | Incumbent re-elected. | nowrap | |- ! | Alphonzo E. Bell Jr. | | Republican | 1960 | Incumbent re-elected. | nowrap | |- ! | George Brown Jr. | | Democratic | 1962 | Incumbent re-elected. | nowrap | |- ! | Edward R. Roybal | | Democratic | 1962 | Incumbent re-elected. | nowrap | |- ! | Charles H. Wilson | | Democratic | 1962 | Incumbent re-elected. | nowrap | |- ! | Craig Hosmer | | Republican | 1952 | Incumbent re-elected. | nowrap | |- ! | Kenneth W. Dyal | | Democratic | 1964 | | Incumbent lost re-election.New member elected.Republican gain. | nowrap | |- ! | Richard T. Hanna | | Democratic | 1962 | Incumbent re-elected. | nowrap | |- ! | James B. Utt | | Republican | 1952 | 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 re-elected. | nowrap | |} Colorado |- ! | Byron G. Rogers | | Democratic | 1950 | Incumbent re-elected. | nowrap | |- ! | Roy H. McVicker | | Democratic | 1964 | | Incumbent lost re-election.New member elected.Republican gain. | 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 re-elected. | nowrap | |- ! | William St. Onge | | Democratic | 1962 | Incumbent re-elected. | nowrap | |- ! | Robert Giaimo | | Democratic | 1958 | Incumbent re-elected. | nowrap | |- ! | Donald J. Irwin | | Democratic | 19581960 1964 | Incumbent re-elected. | nowrap | |- ! | John S. Monagan | | Democratic | 1958 | Incumbent re-elected. | nowrap | |- ! | Bernard F. Grabowski | | Democratic | 1962 | | Incumbent lost re-election.New member elected.Republican gain. | nowrap | |} Delaware |- ! | Harris McDowell | | Democratic |