1966.Democratic gain.Successor was later re-elected, see below. | nowrap | |} Overall results Source: Election Statistics – Office of the Clerk 1 One vacancy due to refusal of House to seat Adam Clayton Powell Jr. (D-New York) Alabama |- ! | Jack Edwards | | Republican | 1964 | Incumbent re-elected. | nowrap | |- ! | William Louis Dickinson | | Republican | 1964 | Incumbent re-elected. | nowrap | |- ! | George W. Andrews | | Democratic | 1944 | Incumbent re-elected. | nowrap | |- ! | Glenn Andrews | | Republican | 1964 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | Armistead I. Selden Jr. | | Democratic | 1952 | Incumbent re-elected. | nowrap | |- ! | John Hall Buchanan Jr. | | Republican | 1964 | Incumbent re-elected. | nowrap | |- ! | James D. Martin | | Republican | 1964 | | Incumbent retired to run for Governor of Alabama.New member elected.Democratic gain. | nowrap | |- ! | Robert E. Jones Jr. | | Democratic | 1947 | Incumbent re-elected. | nowrap | |} Alaska |- ! | Ralph Julian Rivers | | Democratic | 1958 | | Incumbent lost re-election.New member elected.Republican gain. | nowrap | |} Arizona |- ! | John Jacob Rhodes | | Republican | 1952 | Incumbent re-elected. | nowrap | |- ! | Mo Udall | | Democratic | 1961 | Incumbent re-elected. | nowrap | |- ! | George F. Senner Jr. | | Democratic | 1962 | | Incumbent lost re-election.New member elected.Republican gain. | nowrap | |} Arkansas |- ! | Ezekiel C. Gathings | | Democratic | 1938 | Incumbent re-elected. | nowrap | |- ! | Wilbur Mills | | Democratic | 1938 | Incumbent re-elected. | nowrap | |- ! | James William Trimble | | Democratic | 1944 | | Incumbent lost re-election.New member elected.Republican gain. | nowrap | |- ! | Oren Harris | | Democratic | 1940 | | Resigned to become District judge.New member elected.Democratic hold. | nowrap | |} California |- ! | Donald H. Clausen | | Republican | 1963 | Incumbent re-elected. | nowrap | |- ! | Harold T. Johnson | | Democratic | 1958 | Incumbent re-elected. | nowrap | |- ! | John E. Moss | | Democratic | 1952 |