| | Democratic | 1930 | Incumbent re-elected. | nowrap | |- ! | John W. Flannagan Jr. | | Democratic | 1930 | Incumbent re-elected. | nowrap | |} Washington |- ! | Warren Magnuson | | Democratic | 1936 | Incumbent re-elected. | nowrap | |- ! | Monrad C. Wallgren | | Democratic | 1932 | | Incumbent retired to run for U.S. senator.New member elected.Democratic hold. | nowrap | |- ! | Martin F. Smith | | Democratic | 1932 | Incumbent re-elected. | nowrap | |- ! | Knute Hill | | Democratic | 1932 | Incumbent re-elected. | nowrap | |- ! | Charles H. Leavy | | Democratic | 1936 | Incumbent re-elected. | nowrap | |- ! | John M. Coffee | | Democratic | 1936 | Incumbent re-elected. | nowrap | |} West Virginia |- ! | A. C. Schiffler | | Republican | 1938 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | Jennings Randolph | | Democratic | 1932 | Incumbent re-elected. | nowrap | |- ! | Andrew Edmiston Jr. | | Democratic | 1933 | Incumbent re-elected. | nowrap | |- ! | George William Johnson | | Democratic | 1932 | Incumbent re-elected. | nowrap | |- ! | John Kee | | Democratic | 1932 | Incumbent re-elected. | nowrap | |- ! | Joe L. Smith | | Democratic | 1928 | Incumbent re-elected. | nowrap | |} Wisconsin |- ! | Stephen Bolles | | Republican | 1938 | Incumbent re-elected. | nowrap | |- ! | Charles Hawks Jr. | | Republican | 1938 | | Incumbent lost re-election.New member elected.Progressive gain. | nowrap | |- ! | Harry W. Griswold | | Republican | 1938 | | Incumbent died July 4, 1939.New member elected.Republican hold. | nowrap | |- ! | John C. Schafer | | Republican | 1938 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | Lewis D. Thill | | Republican | 1938 | Incumbent re-elected. | nowrap | |- ! | Frank B. Keefe | | Republican | 1938 | Incumbent re-elected. | nowrap | |- ! | Reid F. Murray | | Republican | 1938 | Incumbent re-elected. | nowrap | |- ! | Joshua L. Johns | | Republican | 1938 | Incumbent re-elected. |