| Democratic | 1918 | | Incumbent retired.New member elected.Democratic hold. | nowrap | |- ! | Percy E. Quin | | Democratic | 1912 | Incumbent re-elected. | nowrap | |- ! | James W. Collier | | Democratic | 1908 | Incumbent re-elected. | nowrap | |} Missouri |- ! | Frank C. Millspaugh | | Republican | 1920 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | William W. Rucker | | Democratic | 1898 | | Incumbent lost renomination.New member elected.Democratic hold. | nowrap | |- ! | Henry F. Lawrence | | Republican | 1920 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | Charles L. Faust | | Republican | 1920 | Incumbent re-elected. | nowrap | |- ! | Edgar C. Ellis | | Republican | 1920 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | William O. Atkeson | | Republican | 1920 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | Roscoe C. Patterson | | Republican | 1920 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | Sidney C. Roach | | Republican | 1920 | Incumbent re-elected. | nowrap | |- ! | Theodore W. Hukriede | | Republican | 1920 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | Cleveland A. Newton | | Republican | 1918 | Incumbent re-elected. | nowrap | |- ! | Harry B. Hawes | | Democratic | 1920 | Incumbent re-elected. | nowrap | |- ! | Leonidas C. Dyer | | Republican | 1914 | Incumbent re-elected. | nowrap | |- ! | Marion E. Rhodes | | Republican | 1918 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | Edward D. Hays | | Republican | 1918 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | Isaac V. McPherson | | Republican | 1918 | | Incumbent lost renomination.New member elected.Republican hold. | nowrap | |- ! | Samuel A. Shelton | | Republican | 1920 | | Incumbent retired.New member elected.Democratic gain. | nowrap | |} Montana |- ! | Washington J. McCormick | | Republican | 1920 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap |