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Senator
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Dates of Service
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Length of Service
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1. Robert C. Byrd (D-WV)
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Jan 3, 1959 to Jun 28, 2010
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51 years, 5 months, 26 days
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2. Daniel K. Inouye (D-HI)
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Jan 3, 1963 to Dec 17, 2012
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49 years, 11 months, 15 days
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3. Strom Thurmond (R-SC)
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Dec 14, 1954 to Apr 4, 1956
and Nov 7, 1956 to Jan 3, 2003
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47 years, 5 months, 8 days
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4. Edward M. Kennedy (D-MA)
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Nov 7, 1962 to Aug 25, 2009
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46 years, 9 months, 19 days
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5. Carl T. Hayden (D-AZ)
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Mar 4, 1927 to Jan 3, 1969
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41 years, 9 months, 30 days
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6. John Stennis (D-MS)
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Nov 5, 1947 to Jan 2, 1989
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41 years, 1 month, 29 days
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7. Ted Stevens (R-AK)
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Dec 24, 1968 to Jan 2, 2009
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40 years, 10 days
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8. Ernest F. Hollings (D-SC)
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Nov 9, 1966 to Jan 2, 2005
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38 years, 1 month, 25 days
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9. Richard B. Russell (D-GA)
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Jan 12, 1933 to Jan 21, 1971
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38 years, 19 days
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10. Russell Long (D-LA)
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Dec 31, 1948 to Jan 2, 1987
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38 years, 3 days
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11. Patrick J. Leahy (D-VT)
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Jan 3, 1975 to present
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38 years
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12. Francis E. Warren (R-WY)
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Nov 18, 1890 to Mar 3, 1893
and Mar 4, 1895 to Nov 24, 1929
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37 years, 4 days
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13. James Eastland (D-MS)
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Jun 30, 1941 to Sep 28, 1941
and Jan 3, 1943 to Dec 27, 1978
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36 years, 2 months, 24 days
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14. Warren Magnuson (D-WA)
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Dec 14, 1944 to Jan 2, 1981
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36 years, 20 days
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15. Joseph R. Biden, Jr. (D-DE)
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Jan 3, 1973 to Jan 15, 2009
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36 years, 13 days
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16. Pete V. Domenici (R-NM)
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Jan 3, 1973 to Jan 2, 2009
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36 years
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16. Claiborne Pell (D-RI)
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Jan 3, 1961 to Jan 2, 1997
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36 years
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18. Kenneth D. McKellar (D-TN)
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Mar 4, 1917 to Jan 2, 1953
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35 years, 10 months
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19. Milton R. Young (R-ND)
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Mar 12, 1945 to Jan 2, 1981
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35 years, 9 months, 22 days
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20. Ellison D. Smith (D-SC)
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Mar 4, 1909 to Nov 17, 1944
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35 years, 8 months, 13 days
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21. Allen Joseph Ellender (D-LA)
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Jan 3, 1937 to Jul 27, 1972
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35 years, 6 months, 24 days
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22. Orrin Hatch (R-UT)
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Jan 3, 1977 to present
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36 years
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23. Richard Lugar (R-IN)
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Jan 3, 1977 to Jan 3, 2013
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36 years
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24. William Boyd Allison (R-IA)
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Mar 4, 1873 to Aug 4, 1908
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35 years, 5 months
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25. John McClellan (D-AR)
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Jan 3, 1943 to Nov 28, 1977
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34 years, 11 months
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