State> | gcolor="#cccccc"|Incumbent | bgcolor="#cccccc"|Party | bgcolor="#cccccc"|Status | bgcolor="#cccccc"|Opposing Candidates |
| a href="/encyclopedia/Arizona" title="Arizona">Arizona | Barry Goldwater | Republican | Retired: Republican victory, 51.4 - 48.6 | Paul Fannin (Republican) Roy Elson (Democrat) |
| a href="/encyclopedia/California" title="California">California | Pierre Salinger | Democrat | Defeated, 51.5 - 48.5 | George Murphy (Republican) |
| a href="/encyclopedia/Connecticut" title="Connecticut">Connecticut | Thomas J. Dodd | Democrat | Re-elected, 64.6 - 35.3 | John Lodge (Republican) |
| a href="/encyclopedia/Delaware" title="Delaware">Delaware | John J. Williams | Republican | Re-elected, 51.7 - 48.3 | Elbert N. Carvel (Democrat) |
| a href="/encyclopedia/Florida" title="Florida">Florida | Spessard L. Holland | Democrat | Re-elected, 63.9 - 36.0 | Claude R. Kirk, Jr. (Republican) |
| a href="/encyclopedia/Hawaii" title="Hawaii">Hawaii | Hiram L. Fong | Republican | Re-elected, 53.0 - 46.4 | Thomas P. Gill (Democrat) |
| a href="/encyclopedia/Indiana" title="Indiana">Indiana | Vance Hartke | Democrat | Re-elected, 54.3 - 45.3 | D. Russell Bontrager (Republican) |
| a href="/encyclopedia/Maine" title="Maine">Maine | Edmund S. Muskie | Democrat | Re-elected, 66.6 - 33.4 | Clifford G. McIntyre (Republican) |
| a href="/encyclopedia/Maryland" title="Maryland">Maryland | James Glenn Beall | Republican | Defeated, 62.8 - 37.2 | Joseph D. Tydings (Democrat) |
| a href="/encyclopedia/Massachusetts" title="Massachusetts">Massachusetts | Edward M. Kennedy | Democrat | Re-elected, 74.3 - 25.4 | Howard Whitmore, Jr. (Republican) |
| a href="/encyclopedia/Michigan" title="Michigan">Michigan | Philip A. Hart | Democrat | Re-elected, 64.4 - 35.3 | Elly M. Petersen (Republican) |
| a href="/encyclopedia/Minnesota" title="Minnesota">Minnesota | Eugene J. McCarthy | Democrat | Re-elected, 60.3 - 39.3 | Wheelock Whitney (Republican) |
| a href="/encyclopedia/Mississippi" title="Mississippi">Mississippi | John C. Stennis | Democrat | Re-elected, unopposed | |
| a href="/encyclopedia/Missouri" title="Missouri">Missouri | Stuart Symington | Democrat | Re-elected, 66.6 - 33.4 | Jean P. Bradshaw (Republican) |
| a href="/encyclopedia/Montana" title="Montana">Montana | Mike Mansfield | Democrat | Re-elected, 64.5 - 35.5 | Alex Blewett (Republican) |
| a href="/encyclopedia/Nebraska" title="Nebraska">Nebraska | Roman L. Hruska | Republican | Re-elected, 61.4 - 38.6 | Raymond W. Arndt (Democrat) |
| a href="/encyclopedia/Nevada" title="Nevada">Nevada | Howard W. Cannon | Democrat | Re-elected, 50.0 - 50.0 | Paul Laxalt (Republican) |
| a href="/encyclopedia/New-Jersey" title="New Jersey">New Jersey | Harrison A. Williams, Jr. | Democrat | Re-elected, 61.9 - 37.3 | Bernard M. Shanley (Republican) |
| a href="/encyclopedia/New-Mexico" title="New Mexico">New Mexico | Edwin L. Mechem | Republican | Defeated, 54.7 - 45.3 | Joseph M. Montoya (Democrat) |
| a href="/encyclopedia/New-York" title="New York">New York | Kenneth B. Keating | Republican | Defeated, 53.5 - 43.4 | Robert F. Kennedy (Democrat) |
| a href="/encyclopedia/North-Dakota" title="North Dakota">North Dakota | Quentin N. Burdick | Democrat | Re-elected, 57.6 - 42.4 | Thomas S. Kleppe (Republican) |
| a href="/encyclopedia/Ohio" title="Ohio">Ohio | Stephen M. Young | Democrat | Re-elected, 50.2 - 49.8 | Robert A. Taft, Jr. (Republican) |
| a href="/encyclopedia/Oklahoma" title="Oklahoma">Oklahoma1 | James H. Edmondson | Democrat | Defeated in primary: Democrat victory, 51.2 - 48.8 | Fred R. Harris (Democrat) Bud Wilkinson (Republican) |
| a href="/encyclopedia/Pennsylvania" title="Pennsylvania">Pennsylvania | Hugh Scott | Republican | Re-elected, 50.6 - 49.1 | Genevieve Blatt (Democrat) |
| a href="/encyclopedia/Rhode-Island" title="Rhode Island">Rhode Island | John O. Pastore | Democrat | Re-elected, 82.7 - 17.3 | Ronald R. Lagueux (Republican) |
| a href="/encyclopedia/Tennessee" title="Tennessee">Tennessee | Albert Gore, Sr. | Democrat | Re-elected, 53.6 - 46.4 | Dan H. Kuykendall (Republican) |
| a href="/encyclopedia/Tennessee" title="Tennessee">Tennessee2 | Herbert S. Walters | Democrat | Retired: Democrat victory, 52.1 - 47.4 | Ross Bass (Democrat) Howard H. Baker, Jr. (Republican) |
| a href="/encyclopedia/Texas" title="Texas">Texas | Ralph Yarborough | Democrat | Re-elected, 56.2 - 43.6 | George H. W. Bush (Republican) |
| a href="/encyclopedia/Utah" title="Utah">Utah | Frank E. Moss | Democrat | Re-elected, 57.3 - 42.7 | Ernest L. Wilkinson (Republican) |
| a href="/encyclopedia/Vermont" title="Vermont">Vermont | Winston L. Prouty | Republican | Re-elected, 53.5 - 46.5 | Frederick J. Fayette (Democrat) |
| a href="/encyclopedia/Virginia" title="Virginia">Virginia | Harry F. Byrd | Democrat | Re-elected, 63.8 - 19.0 - 10.3 | Richard A. May (Republican) James W. Respess (Independent) |
| a href="/encyclopedia/Washington" title="Washington">Washington | Henry M. Jackson | Democrat | Re-elected, 72.2 - 27.8 | Lloyd J. Andrews (Republican) |
| a href="/encyclopedia/West-Virginia" title="West Virginia">West Virginia | Robert C. Byrd | Democrat | Re-elected, 67.7 - 32.3 | Cooper P. Benedict (Republican) |
| a href="/encyclopedia/Wisconsin" title="Wisconsin">Wisconsin | William Proxmire | Democrat | Re-elected, 53.3 - 46.6 | Wilbur N. Renk (Republican) |
| a href="/encyclopedia/Wyoming" title="Wyoming">Wyoming | Gale McGee | Democrat | Re-elected, 54.0 - 46.0 | John S. Wold (Republican)
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