State> | gcolor="#cccccc"|Incumbent | bgcolor="#cccccc"|Party | bgcolor="#cccccc"|Status | bgcolor="#cccccc"|Opposing Candidates |
| a href="/encyclopedia/Alabama" title="Alabama">Alabama | Hugo L. Black | Democrat | Re-elected, 86.3 - 13.8 | J. Theodore Johnson (Republican) |
| a href="/encyclopedia/Arizona" title="Arizona">Arizona | Carl Hayden | Democrat | Re-elected, 66.7 - 32.1 | Ralph H. Cameron (Republican) |
| a href="/encyclopedia/Arkansas" title="Arkansas">Arkansas | Hattie W. Caraway | Democrat | Re-elected, 89.5 - 10.5 | John W. White (Republican) |
| a href="/encyclopedia/California" title="California">California | Samuel M. Shortridge | Republican | Retired: Democrat victory, 43.4 - 30.8 - 25.8 | William G. McAdoo (Democrat) Tallant Tubbs (Republican) Robert P. Schuler (Independent) |
| a href="/encyclopedia/Colorado" title="Colorado">Colorado | Karl C. Schuyler | Republican | Defeated, 51.9 - 45.5 | Alva B. Adams (Democrat) |
| a href="/encyclopedia/Connecticut" title="Connecticut">Connecticut | Hiram Bingham III | Republican | Defeated, 48.5 - 47.7 | Augustine Lonergan (Democrat) |
| a href="/encyclopedia/Florida" title="Florida">Florida | Duncan U. Fletcher | Democrat | Re-elected, 99.8 | |
| a href="/encyclopedia/Georgia-(U.S.-state)" title="Georgia (U.S. state)">Georgia1 | John S. Cohen | Democrat | Retired: Democrat victory, unopposed | Richard Russell, Jr. (Democrat) |
| a href="/encyclopedia/Georgia-(U.S.-state)" title="Georgia (U.S. state)">Georgia | Walter F. George | Democrat | Re-elected, 92.8 - 7.2 | James W. Arnold (Republican) |
| a href="/encyclopedia/Idaho" title="Idaho">Idaho | John Thomas | Republican | Defeated, 55.7 - 42.3 | James Pope (Democrat) |
| a href="/encyclopedia/Illinois" title="Illinois">Illinois | Otis F. Glenn | Republican | Defeated, 52.2 - 46.0 | William H. Dieterich (Democrat) |
| a href="/encyclopedia/Indiana" title="Indiana">Indiana | James E. Watson | Republican | Defeated, 55.6 - 42.3 | Frederick Van Nuys (Democrat) |
| a href="/encyclopedia/Iowa" title="Iowa">Iowa | Smith W. Brookhart | Republican | Defeated in primary: Democrat victory, 54.9 - 40.8 | Richard L. Murphy (Democrat) Henry Field (Republican) |
| a href="/encyclopedia/Kansas" title="Kansas">Kansas | George McGill | Democrat | Re-elected, 45.7 - 42.0 | Ben S. Paulen (Republican) |
| a href="/encyclopedia/Kentucky" title="Kentucky">Kentucky | Alben W. Barkley | Democrat | Re-elected, 59.2 - 40.5 | M. H. Thatcher (Republican) |
| a href="/encyclopedia/Louisiana" title="Louisiana">Louisiana | Edwin S. Broussard | Democrat | Retired: Democrat victory, unopposed | John H. Overton (Democrat) |
| a href="/encyclopedia/Maryland" title="Maryland">Maryland | Millard E. Tydings | Democrat | Re-elected, 66.2 - 31.2 | Wallace Williams (Republican) |
| a href="/encyclopedia/Missouri" title="Missouri">Missouri | Harry B. Hawes | Democrat | Retired: Democrat victory, 63.2 - 35.9 | Bennett Champ Clark (Democrat) Harry W. Kiel (Republican) |
| a href="/encyclopedia/Nevada" title="Nevada">Nevada | Tasker L. Oddie | Republican | Defeated, 52.1 - 47.9 | Patrick A. McCarran (Democrat) |
| a href="/encyclopedia/New-Hampshire" title="New Hampshire">New Hampshire | George H. Moses | Republican | Defeated, 50.4 - 49.3 | Fred H. Brown (Democrat) |
| a href="/encyclopedia/New-Jersey" title="New Jersey">New Jersey2 | W. Warren Barbour | Republican | Re-elected, 49.6 - 48.5 | Percy H. Stewart (Democrat) |
| a href="/encyclopedia/New-York" title="New York">New York | Robert F. Wagner | Democrat | Re-elected, 55.8 - 38.6 | George Z. Medalie (Republican) |
| a href="/encyclopedia/North-Carolina" title="North Carolina">North Carolina | Lee S. Overman | Democrat | Retired: Democrat victory, 68.3 - 31.7 | Robert R. Reynolds (Democrat) Jake F. Newell (Republican) |
| a href="/encyclopedia/North-Dakota" title="North Dakota">North Dakota | Gerald P. Nye | Republican | Re-elected, 72.3 - 27.5 | P. W. Lanier (Democrat) |
| a href="/encyclopedia/Ohio" title="Ohio">Ohio | Robert J. Bulkley | Democrat | Re-elected, 52.5 - 45.8 | Gilbert Bettman (Republican) |
| a href="/encyclopedia/Oklahoma" title="Oklahoma">Oklahoma | Elmer Thomas | Democrat | Re-elected, 65.6 - 33.7 | Wirt Franklin (Republican) |
| a href="/encyclopedia/Oregon" title="Oregon">Oregon | Frederick Steiwer | Republican | Re-elected, 52.7 - 38.9 | Walter B. Gleason (Democrat) |
| a href="/encyclopedia/Pennsylvania" title="Pennsylvania">Pennsylvania | James J. Davis | Republican | Re-elected, 49.3 - 43.2 | Lawrence H. Rupp (Democrat) |
| a href="/encyclopedia/South-Carolina" title="South Carolina">South Carolina | Ellison D. Smith | Democrat | Re-elected, unopposed | |
| a href="/encyclopedia/South-Dakota" title="South Dakota">South Dakota | Peter Norbeck | Republican | Re-elected, 53.8 - 44.6 | U. S. G. Cherry (Democrat) |
| a href="/encyclopedia/Utah" title="Utah">Utah | Reed Smoot | Republican | Defeated, 56.7 - 41.7 | Elbert D. Thomas (Democrat) |
| a href="/encyclopedia/Vermont" title="Vermont">Vermont | Porter H. Dale | Republican | Re-elected, 55.1 - 44.9 | Fred C. Martin (Democrat) |
| a href="/encyclopedia/Washington" title="Washington">Washington | Wesley L. Jones | Republican | Defeated, 60.6 - 32.7 | Homer T. Bone (Democrat) |
| a href="/encyclopedia/Wisconsin" title="Wisconsin">Wisconsin | John J. Blaine | Republican | Retired: Democrat victory, 57.0 - 36.2 - 6.1 | F. Ryan Duffy (Democrat) John B. Chapple (Republican) Emil Seidel (Socialist)
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