None (District created) | |New seat.New member elected.Democratic gain. | nowrap | |} Arizona |- ! | Carl Hayden | | Democratic | 1911 | Incumbent re-elected. | nowrap | |} Arkansas |- ! | Robert B. Macon | | Democratic | 1902 | | New member elected.Democratic Hold | nowrap | |- ! | William A. Oldfield | | Democratic | 1908 | Incumbent re-elected. | nowrap | |- ! | John C. Floyd | | Democratic | 1904 | Incumbent re-elected. | nowrap | |- ! | William B. Cravens | | Democratic | 1906 | | New member elected.Democratic Hold | nowrap | |- ! | Henderson M. Jacoway | | Democratic | 1910 | Incumbent re-elected. | nowrap | |- ! | Joseph Taylor Robinson | | Democratic | 1902 | | Incumbent retired to run for Arkansas Governor.New member elected.Democratic Hold | nowrap | |- ! | William S. Goodwin | | Democratic | 1910 | Incumbent re-elected. | nowrap | |} California |- ! | William Kent | | Republican | 1910 | | Incumbent re-elected as an Independent.Independent gain. | nowrap | |- ! | John E. Raker | | Democratic | 1910 | Incumbent re-elected. | nowrap | |- ! | colspan=3 | None (District created) | | New seat.New member elected.Republican gain. | nowrap | |- ! | Julius Kahn | | Republican | 1898 | Incumbent re-elected. | nowrap | |- ! | colspan=3 | None (District created) | | New seat.New member elected.Republican gain. | nowrap | |- ! | Joseph R. Knowland | | Republican | 1904 | Incumbent re-elected. | nowrap | |- ! | James C. Needham | | Republican | 1898 | | Incumbent lost re-election.New member elected.Democratic gain. | nowrap | |- ! | Everis A. Hayes | | Republican | 1904 | Incumbent re-elected. | nowrap | |- ! | colspan=3 | None (District created) | | New seat.New member elected.Progressive gain. | nowrap | |- ! | William Stephens | | Republican | 1910 | | Incumbent re-elected to different party.Progressive gain. | nowrap | |- ! | Sylvester C. Smith | | Republican | 1904 | | Incumbent retired.New member elected.Democratic gain.Incumbent died before the Congress ended. | nowrap | |} Colorado |- ! | Atterson W. Rucker | | Democratic | 1908 | | Incumbent lost renomination.New member elected.Democratic hold.