7, 1940.New member elected October 1, 1940.Democratic hold.Winner did not run for re-election in November, see below. | nowrap | |- ! | William B. Bankhead | | Democratic | 1916 | | Incumbent died September 15, 1940.New member elected November 5, 1940.Democratic hold.Winner did not run for the next term, see below. | nowrap | |- ! | John Andrew Martin | | Democratic | 19081912 1932 | | Incumbent died December 23, 1939.New member elected November 5, 1940.Democratic hold.Winner did not run for the next term, see below. | nowrap | |- ! | colspan=3 | | New member elected November 5, 1940.Successor also elected the same day to the next term, see below. | nowrap | |- ! | colspan=3 | | New member elected November 5, 1940.Successor also elected the same day to the next term, see below. | nowrap | |- ! | colspan=3 | | New member elected November 5, 1940.Successor also elected the same day to the next term, see below. | nowrap | |- ! | colspan=3 | | New member elected November 5, 1940.Successor also elected the same day to the next term, see below. | nowrap | |} Alabama |- ! | Frank W. Boykin | | Democratic | 1935 | Incumbent re-elected. | nowrap | |- ! | George M. Grant | | Democratic | 1938 | Incumbent re-elected. | nowrap | |- ! | Henry B. Steagall | | Democratic | 1914 | Incumbent re-elected. | nowrap | |- ! | Sam Hobbs | | Democratic | 1934 | Incumbent re-elected. | nowrap | |- ! | Joe Starnes | | Democratic | 1934 | Incumbent re-elected. | nowrap | |- ! | Pete Jarman | | Democratic | 1936 | Incumbent re-elected. | nowrap | |- ! | William B. Bankhead | | Democratic | 1916 | | Incumbent died September 15, 1940.New member elected.Democratic hold. | nowrap | |- ! | John Sparkman | | Democratic | 1936 | Incumbent re-elected. | nowrap | |- ! | Luther Patrick | | Democratic | 1936 | Incumbent re-elected. | nowrap | |} Arizona |- ! | John R. Murdock | | Democratic | 1936 | Incumbent re-elected. | nowrap | |} Arkansas |- ! | Ezekiel C. Gathings | | Democratic | 1938 | Incumbent re-elected. | nowrap | |- ! | Wilbur Mills | | Democratic