| State
| Incumbent
| Party
| Status
| Opposing Candidates
|
| Alabama1
| Braxton B. Comer
| Democrat
| Retired: Democrat victory, 71.4 - 27.4
| J. Thomas Heflin (Democrat) C. P. Lunsford (Republican)
|
| Alabama
| Oscar W. Underwood
| Democrat
| Re-elected, 68.0 - 31.2
| L. H. Reynolds (Republican)
|
| Arizona
| Marcus A. Smith
| Democrat
| Defeated, 55.2 - 44.8
| Ralph H. Cameron (Republican)
|
| Arkansas
| William F. Kirby
| Democrat
| Retired: Democrat victory, 65.9 - 34.1
| Thaddeus H. Caraway (Democrat) Charles F. Cole (Republican)
|
| California
| James D. Phelan
| Democrat
| Defeated, 49.0 - 40.7 - 6.3
| Samuel M. Shortridge (Republican) James S. Edwards (Independent)
|
| Colorado
| Charles S. Thomas
| Democrat
| Retired: Republican victory, 54.5 - 39.3
| Samuel D. Nicholson (Republican) Tully Scot (Democrat)
|
| Connecticut
| Frank B. Brandegee
| Republican
| Re-elected, 59.4 - 36.1
| Augustine Lonergan (Democrat)
|
| Florida
| Duncan U. Fletcher
| Democrat
| Re-elected, 74.3 - 21.0
| John M. Cheney (Republican)
|
| Georgia
| Hoke Smith
| Democrat
| Retired: Democrat victory, 94.9 - 5.1
| Thomas Watson (Democrat) Harvey S. Edwards (Independent)
|
| Idaho
| John F. Nugent
| Democrat
| Defeated, 54.1 - 45.9
| Frank R. Gooding (Republican)
|
| Illinois
| Lawrence Y. Sherman
| Republican
| Retired: Republican victory, 66.8 - 26.8
| William B. McKinley (Republican) Peter A. Waller (Democrat)
|
| Indiana
| James E. Watson
| Republican
| Re-elected, 54.6 - 41.2
| Thomas Taggart (Democrat)
|
| Iowa
| Albert B. Cummins
| Republican
| Re-elected, 61.4 - 37.4
| Claude R. Porter (Democrat)
|
| Kansas
| Charles Curtis
| Republican
| Re-elected, 64.0 - 33.4
| George H. Hodges (Democrat)
|
| Kentucky
| John C. W. Beckham
| Democrat
| Defeated, 50.3 - 49.7
| Richard P. Ernst (Republican)
|
| Louisiana
| Edward J. Gay
| Democrat
| Retired: Democrat victory, unopposed
| Edwin S. Broussard (Democrat)
|
| Maryland
| John W. Smith
| Democrat
| Defeated, 47.3 - 43.3
| Ovington E. Weller (Republican)
|
| Missouri
| Selden P. Spencer
| Republican
| Re-elected, 53.7 - 44.5
| Breckenridge Long (Democrat)
|
| Nevada
| Charles B. Henderson
| Democrat
| Defeated, 42.1 - 37.9 - 18.2
| Tasker L. Oddie (Republican) Anne Martin (Independent)
|
| New Hampshire
| George H. Moses
| Republican
| Re-elected, 57.7 - 41.6
| Raymond B. Stevens (Democrat)
|
| New York
| James W. Wadsworth, Jr.
| Republican
| Re-elected, 52.4 - 32.9 - 7.8 - 5.8
| Harry C. Walker (Democrat) Jacob Panken (Socialist) Ella A. Boole (Independent)
|
| North Carolina
| Lee S. Overman
| Democrat
| Re-elected, 57.5 - 42.5
| A. E. Holton (Republican)
|
| North Dakota
| Asle J. Gronna
| Republican
| Retired: Republican victory, 59.8 - 40.2
| Edwin F. Ladd (Republican) H. H. Perry (Democrat)
|
| Ohio
| Warren G. Harding
| Republican
| Retired: Republican victory, 59.1 - 40.8
| Frank B. Willis (Republican) W. A. Julian (Democrat)
|
| Oklahoma
| Thomas P. Gore
| Democrat
| Retired: Republican victory, 50.6 - 44.6
| John W. Harreld (Republican) Scott Ferris (Democrat)
|
| Oregon
| George E. Chamberlain
| Democrat
| Defeated, 50.7 - 43.5
| Robert N. Stanfield (Republican)
|
| Pennsylvania
| Boies Penrose
| Republican
| Re-elected, 59.9 - 27.2 - 7.4
| John A. Farrell (Democrat) Leah C. Marion (Independent)
|
| South Carolina
| Ellison D. Smith
| Democrat
| Re-elected, unopposed
|
|
| South Dakota
| Edwin S. Johnson
| Democrat
| Retired: Republican victory, 50.1 - 24.1 - 20.0 - 5.5
| Peter Norbeck (Republican) Tom Ayres (Independent) U. S. G. Cherry (Democrat) R. O. Richards (Independent)
|
| Utah
| Reed Smoot
| Republican
| Re-elected, 56.6 - 38.6
| Milton H. Welling (Democrat)
|
| Vermont
| William P. Dillingham
| Republican
| Re-elected, 78.0 - 21.9
| Howard E. Shaw (Democrat)
|
| Virginia2
| Carter Glass
| Democrat
| Re-elected, 91.3 - 8.7
| J. R. Pollard (Republican)
|
| Washington
| Wesley L. Jones
| Republican
| Re-elected, 56.4 - 25.4 - 17.8
| C. L. France (Farmer-Labor) George F. Cotterill (Democrat)
|
| Wisconsin
| Irving L. Lenroot
| Republican
| Re-elected, 41.6 - 34.7 - 13.2 - 9.8
| James Thompson (Independent) Paul S. Reinsch (Democrat) Frank J. Weber (Socialist)
|