These 25 individuals have served the longest U.S. Senate terms as of June 11, 2024.
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| Senators | Dates of Senate Service | Length of Service | |
| 1. | Robert C. Byrd (D-WV) | Jan 3, 1959–Jun 28, 2010 | 51 years, 5 months, 26 days |
| 2. | Daniel K. Inouye (D-HI) | Jan 3, 1963–Dec 17, 2012 | 49 years, 11 months, 15 days |
| 3. | Patrick J. Leahy (D-VT) | Jan 3, 1975–Jan 3, 2023 | 48 years |
| 4. | Strom Thurmond (D, R-SC) | Dec 14, 1954–Apr 4, 1956 and Nov 7, 1956–Jan 3, 2003 | 47 years, 5 months, 8 days |
| 5. | Edward M. Kennedy (Ted) (D-MA) | Nov 7, 1962–Aug 25, 2009 | 46 years, 9 months, 19 days |
| 6. | Chuck Grassley (R-IA) | Jan 3, 1981-present | 43 years, 5 months, 8 days |
| 7. | Orrin G. Hatch (R-UT) | Jan 3, 1977–Jan 3, 2019 | 42 years |
| 8. | Carl T. Hayden (D-AZ) | Mar 4, 1927–Jan 3, 1969 | 41 years, 10 months |
| 9. | John C. Stennis (D-MS) | Nov 5, 1947–Jan 3, 1989 | 41 years, 1 month, 29 days |
| 10. | Ted Stevens (R-AK) | Dec 24, 1968–Jan 3, 2009 | 40 years, 10 days |
| 11. | Mitch McConnell (R-KY) | Jan 3, 1985–present | 39 years, 5 months, 8 days |
| 12. | Thad Cochran (R-MS) | Dec 27, 1978–Apr 1, 2018 | 39 years, 3 months, 6 days |
| 13. | Fritz Hollings (D-SC) | Nov 9, 1966–Jan 3, 2005 | 38 years, 1 month, 25 days |
| 14. | Richard B. Russell, Jr. (D-GA) | Jan 12, 1933–Jan 21, 1971 | 38 years, 10 days |
| 15. | Russell B. Long (D-LA) | Dec 31, 1948–Jan 3, 1987 | 38 years, 3 days |
| 16. | Francis E. Warren (R-WY) | Nov 18, 1890–Mar 3, 1893 and Mar 4, 1895-Nov 24, 1929 | 37 years, 4 days |
| 17. | James O. Eastland (D-MS) | Jun 30, 1941–Sep 28, 1941 and Jan 3, 1943–Dec 27, 1978 | 36 years, 2 months, 24 days |
| 18. | Warren G. Magnuson (D-WA) | Dec 14, 1944–Jan 3,1981 | 36 years, 20 days |
| 19. | Joe Biden (D-DE) | Jan 3, 1973–Jan 15, 2009 | 36 years, 13 days |
| 20. | Pete V. Domenici (R-NM) | Jan 3, 1973–Jan 3, 2009 | 36 years |
| 20. | Carl Levin (D-MI) | Jan 3, 1979–Jan 3, 2015 | 36 years |
| 20. | Richard G. Lugar (R-IN) | Jan 3, 1977–Jan 3, 2013 | 36 years |
| 20. | Claiborne Pell (D-RI) | Jan 3, 1961–Jan 3, 1997 | 36 years |
| 20. | Richard C. Shelby (R-AL) | Jan 3, 1987–Jan 3, 2023 | 36 years |
| 25. | Kenneth D. McKellar (D-TN) | Mar 4, 1917–Jan 3, 1953 | 35 years, 10 months |
