State> | gcolor="#cccccc"|Incumbent | bgcolor="#cccccc"|Party | bgcolor="#cccccc"|Status | bgcolor="#cccccc"|Opposing Candidates |
| a href="/encyclopedia/Arizona" title="Arizona">Arizona | Henry F. Ashurst | Democrat | Re-elected, 72.0 - 25.6 | J. E. Thompson (Republican) |
| a href="/encyclopedia/California" title="California">California | Hiram W. Johnson | Republican | Re-elected, 94.5 - 5.3 | George R. Kirkpatrick (Socialist) |
| a href="/encyclopedia/Connecticut" title="Connecticut">Connecticut | Frederic C. Walcott | Republican | Defeated, 51.8 - 48.3 | Francis T. Maloney (Democrat) |
| a href="/encyclopedia/Delaware" title="Delaware">Delaware | John G. Townsend, Jr. | Republican | Re-elected, 53.3 - 46.2 | Wilbur L. Adams (Democrat) |
| a href="/encyclopedia/Florida" title="Florida">Florida | Park Trammell | Democrat | Re-elected, unopposed | |
| a href="/encyclopedia/Indiana" title="Indiana">Indiana | Arthur R. Robinson | Republican | Defeated, 51.5 - 47.5 | Sherman Minton (Democrat) |
| a href="/encyclopedia/Maine" title="Maine">Maine | Frederick Hale | Republican | Re-elected, 50.1 - 49.7 | F. Harold Dubord (Democrat) |
| a href="/encyclopedia/Maryland" title="Maryland">Maryland | Phillips Lee Goldsborough | Republican | Retired: Democrat victory, 56.1 - 42.0 | George L. P. Radcliffe (Democrat) Joseph I. France (Republican) |
| a href="/encyclopedia/Massachusetts" title="Massachusetts">Massachusetts | David I. Walsh | Democrat | Re-elected, 59.4 - 37.4 | Robert M. Washburn (Republican) |
| a href="/encyclopedia/Michigan" title="Michigan">Michigan | Arthur H. Vandenberg | Republican | Re-elected, 51.3 - 47.0 | Frank A. Picard (Democrat) |
| a href="/encyclopedia/Minnesota" title="Minnesota">Minnesota | Henrik Shipstead | Farmer-Labor | Re-elected, 49.9 - 29.2 - 19.8 | Einar Holdale (Democrat) N. J. Holmberg (Republican) |
| a href="/encyclopedia/Mississippi" title="Mississippi">Mississippi | Hubert D. Stephens | Democrat | Retired: Democrat victory, unopposed | Theodore G. Bilbo (Democrat) |
| a href="/encyclopedia/Missouri" title="Missouri">Missouri | Roscoe C. Patterson | Republican | Defeated, 59.5 - 39.7 | Harry S. Truman (Democrat) |
| a href="/encyclopedia/Montana" title="Montana">Montana | Burton K. Wheeler | Democrat | Re-elected, 70.1 - 28.7 | George M. Bourquin (Republican) |
| a href="/encyclopedia/Montana" title="Montana">Montana1 | John E. Erickson | Democrat | Defeated in primary: Democrat victory, 59.6 - 39.5 | James E. Murray (Democrat) Scott Leavitt (Republican) |
| a href="/encyclopedia/Nebraska" title="Nebraska">Nebraska | Richard C. Hunter | Democrat | Retired: Democrat victory, 55.3 - 42.9 | Edward R. Burke (Democrat) Robert G. Simmons (Republican) |
| a href="/encyclopedia/Nevada" title="Nevada">Nevada | Key Pittman | Democrat | Re-elected, 64.5 - 33.4 | George W. Malone (Republican) |
| a href="/encyclopedia/New-Jersey" title="New Jersey">New Jersey | Hamilton F. Kean | Republican | Defeated, 57.9 - 40.9 | A. Harry Moore (Democrat) |
| a href="/encyclopedia/New-Mexico" title="New Mexico">New Mexico | Bronson M. Cutting | Republican | Re-elected, 40.2 - 49.4 | Dennis Chavez (Democrat) |
| a href="/encyclopedia/New-Mexico" title="New Mexico">New Mexico2 | Carl A. Hatch | Democrat | Re-elected, 54.5 - 45.0 | Richard C. Dillon (Republican) |
| a href="/encyclopedia/New-York" title="New York">New York | Royal S. Copeland | Democrat | Re-elected, 55.3 - 36.9 - 5.3 | E. Harold Cluett (Republican) Norman Thomas (Socialist) |
| a href="/encyclopedia/North-Dakota" title="North Dakota">North Dakota | Lynn J. Frazier | Republican | Re-elected, 58.2 - 40.2 | Henry Holt (Democrat) |
| a href="/encyclopedia/Ohio" title="Ohio">Ohio | Simeon D. Fess | Republican | Defeated, 60.0 - 39.4 | Vic Donahey (Democrat) |
| a href="/encyclopedia/Pennsylvania" title="Pennsylvania">Pennsylvania | David A. Reed | Republican | Defeated, 50.8 - 46.5 | Joseph F. Guffey (Democrat) |
| a href="/encyclopedia/Rhode-Island" title="Rhode Island">Rhode Island | Felix Hebert | Republican | Defeated, 57.1 - 42.9 | Peter G. Gerry (Democrat) |
| a href="/encyclopedia/Tennessee" title="Tennessee">Tennessee | Kenneth D. McKellar | Democrat | Re-elected, 63.4 - 35.8 | Ben W. Hooper (Republican) |
| a href="/encyclopedia/Tennessee" title="Tennessee">Tennessee3 | Nathan L. Bachman | Democrat | Re-elected, 80.1 - 19.9 | John R. Neal (Independent) |
| a href="/encyclopedia/Texas" title="Texas">Texas | Tom Connally | Democrat | Re-elected, 96.7 | |
| a href="/encyclopedia/Utah" title="Utah">Utah | William H. King | Democrat | Re-elected, 53.1 - 45.4 | Don B. Colton (Republican) |
| a href="/encyclopedia/Vermont" title="Vermont">Vermont | Warren R. Austin | Republican | Re-elected, 51.0 - 48.4 | Fred C. Martin (Democrat) |
| a href="/encyclopedia/Vermont" title="Vermont">Vermont4 | Ernest W. Gibson | Republican | Re-elected, 58.2 - 41.8 | Harry W. Witters (Democrat) |
| a href="/encyclopedia/Virginia" title="Virginia">Virginia | Harry F. Byrd | Democrat | Re-elected, 76.0 - 20.9 | Lawrence C. Page (Republican) |
| a href="/encyclopedia/Washington" title="Washington">Washington | Clarence C. Dill | Democrat | Retired: Democrat victory, 60.9 - 34.0 | Lewis B. Schwellenbach (Democrat) Reno Odlin (Republican) |
| a href="/encyclopedia/West-Virginia" title="West Virginia">West Virginia | Henry D. Hatfield | Republican | Defeated, 55.1 - 44.4 | Rush D. Holt (Democrat) |
| a href="/encyclopedia/Wisconsin" title="Wisconsin">Wisconsin | Robert M. La Follette, Jr. | Progressive | Re-elected, 47.8 - 24.2 - 22.8 | John M. Callahan (Democrat) John B. Chapple (Republican) |
| a href="/encyclopedia/Wyoming" title="Wyoming">Wyoming | Joseph C. O'Mahoney | Democrat | Re-elected, 56.6 - 43.0 | Vincent Carter (Republican)
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