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Longest Serving Senators


These 25 individuals have served the longest U.S. Senate terms as of January 14, 2019.

SenatorsDates of Senate ServiceLength of Service
1. Byrd, Robert C. (D-WV) Jan 3, 1959-Jun 28, 2010 51_5_2651 years, 5 months, 26 days
2. Inouye, Daniel K. (D-HI) Jan 3, 1963-Dec 17, 2012 49_11_1549 years, 11 months, 15 days
3. Thurmond, Strom (R-SC) Dec 14, 1954-Apr 4, 1956
and Nov 7, 1956-Jan 3, 2003
47_05_0847 years, 5 months, 8 days
4. Kennedy, Edward M. (D-MA) Nov 7, 1962-Aug 25, 2009 46_09_1946 years, 9 months, 19 days
5. Leahy, Patrick J. (D-VT) Jan 3, 1975-present 4444 years
6. Hatch, Orrin (R-UT) Jan 3, 1977-Jan 3, 2019 4242 years
7. Hayden, Carl T. (D-AZ) Mar 4, 1927-Jan 3, 1969 41_09_3041 years, 9 months, 30 days
8. Stennis, John (D-MS) Nov 5, 1947-Jan 3, 1989 41_01_2941 years, 1 month, 29 days
9. Stevens, Ted (R-AK) Dec 24, 1968-Jan 3, 2009 40_00_1040 years, 10 days
10. Cochran, Thad (R-MS) Dec 27, 1978-Apr 1, 2018 39_03_0639 years, 3 months, 6 days
11. Hollings, Ernest F. (D-SC) Nov 9, 1966-Jan 3, 2005 38_01_2538 years, 1 month, 25 days
12. Grassley, Charles E. (R-IA) Jan 3, 1981-present 38_00_1138 years, 11 days
13. Russell, Richard B. (D-GA) Jan 12, 1933-Jan 21, 1971 38_00_1038 years, 10 days
14. Long, Russell (D-LA) Dec 31, 1948-Jan 3, 1987 38_00_0338 years, 3 days
15. Warren, Francis E. (R-WY) Nov 18, 1890-Mar 3, 1893
and Mar 4, 1895-Nov 24, 1929
37_00_0437 years, 4 days
16. Eastland, James (D-MS) Jun 30, 1941-Sep 28, 1941
and Jan 3, 1943-Dec 27, 1978
36_02_2436 years, 2 months, 24 days
17. Magnuson, Warren (D-WA) Dec 14, 1944-Jan 3,1981 36_00_2036 years, 20 days
18. Biden, Joseph R., Jr. (D-DE) Jan 3, 1973-Jan 15, 2009 36_00_1336 years, 13 days
19. Domenici, Pete V. (R-NM) Jan 3, 1973-Jan 3, 2009 3636 years
19. Levin, Carl (D-MI) Jan 3, 1979-Jan 3, 2015 3636 years
19. Lugar, Richard (R-IN) Jan 3, 1977-Jan 3, 2013 3636 years
19. Pell, Claiborne (D-RI) Jan 3, 1961-Jan 3, 1997 3636 years
23. McKellar, Kenneth D. (D-TN) Mar 4, 1917-Jan 3, 1953 35_10_0035 years, 10 months
24. Young, Milton R. (R-ND) Mar 12, 1945-Jan 3, 1981 35_09_2235 years, 9 months, 22 days
25. Smith, Ellison D. (D-SC) Mar 4, 1909-Nov 17, 1944 35_08_1335 years, 8 months, 13 days