| Donald H. Clausen | | Republican | 1963 | Incumbent re-elected. | nowrap | |- | | Harold T. Johnson | | Democratic | 1958 | Incumbent re-elected. | nowrap | |- | | John E. Moss | | Democratic | 1952 | Incumbent re-elected. | nowrap | |- | | Robert L. Leggett | | Democratic | 1962 | Incumbent re-elected. | nowrap | |- | | Phillip Burton | | Democratic | 1964 | Incumbent re-elected. | nowrap | |- | | William S. Mailliard | | Republican | 1952 | Incumbent re-elected. | nowrap | |- | | Jeffery Cohelan | | Democratic | 1958 | Incumbent re-elected. | nowrap | |- | | George P. Miller | | Democratic | 1944 | Incumbent re-elected. | nowrap | |- | | Don Edwards | | Democratic | 1962 | Incumbent re-elected. | nowrap | |- | | Charles S. Gubser | | Republican | 1952 | Incumbent re-elected. | nowrap | |- | | J. Arthur Younger | | Republican | 1952 | Incumbent re-elected. | nowrap | |- | | Burt L. Talcott | | Republican | 1962 | Incumbent re-elected. | nowrap | |- | | Charles M. Teague | | Republican | 1954 | Incumbent re-elected. | nowrap | |- | | John F. Baldwin Jr. | | Republican | 1954 | Incumbent re-elected. | nowrap | |- | | John J. McFall | | Democratic | 1956 | Incumbent re-elected. | nowrap | |- | | B. F. Sisk | | Democratic | 1954 | Incumbent re-elected. | nowrap | |- | | Cecil R. King | | Democratic | 1942 | Incumbent re-elected. | nowrap | |- | | Harlan Hagen | | Democratic | 1952 | Incumbent re-elected. | nowrap | |- | | Chet Holifield | | Democratic | 1942 | Incumbent re-elected. | nowrap | |- | | H. Allen Smith | | Republican | 1956 | Incumbent re-elected. | nowrap | |- | | Augustus Hawkins | | Democratic | 1962 | Incumbent re-elected. | nowrap | |- | | James C. Corman | | Democratic | 1960 | Incumbent re-elected. | nowrap | |- | | Del M. Clawson | | Republican | 1963 | Incumbent re-elected. | nowrap | |- | | Glenard P. Lipscomb | | Republican | 1953 | Incumbent re-elected. | nowrap