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Longest-Serving Senators


These 25 individuals have served the longest U.S. Senate terms as of January 3, 2020.

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SenatorsDates of Senate ServiceLength of Service
1. ByrdRobert C. Byrd (D-WV) Jan 3, 1959-Jun 28, 2010 51_5_2651 years, 5 months, 26 days
2. InouyeDaniel K. Inouye (D-HI) Jan 3, 1963-Dec 17, 2012 49_11_1549 years, 11 months, 15 days
3. ThurmondStrom Thurmond (D, R-SC) Dec 14, 1954-Apr 4, 1956
and Nov 7, 1956-Jan 3, 2003
47_05_0847 years, 5 months, 8 days
4. KennedyEdward M. Kennedy (Ted) (D-MA) Nov 7, 1962-Aug 25, 2009 46_09_1946 years, 9 months, 19 days
5. LeahyPatrick J. Leahy (D-VT) Jan 3, 1975-present 4545 years
6. HatchOrrin G. Hatch (R-UT) Jan 3, 1977-Jan 3, 2019 4242 years
7. HaydenCarl T. Hayden (D-AZ) Mar 4, 1927-Jan 3, 1969 41_09_3041 years, 9 months, 30 days
8. StennisJohn C. Stennis (D-MS) Nov 5, 1947-Jan 3, 1989 41_01_2941 years, 1 month, 29 days
9. StevensTed Stevens (R-AK) Dec 24, 1968-Jan 3, 2009 40_00_1040 years, 10 days
10. CochranThad Cochran (R-MS) Dec 27, 1978-Apr 1, 2018 39_03_0639 years, 3 months, 6 days
11. GrassleyChuck Grassley (R-IA) Jan 3, 1981-present 3939 years
12. HollingsFritz Hollings (D-SC) Nov 9, 1966-Jan 3, 2005 38_01_2538 years, 1 month, 25 days
13. RussellRichard B. Russell, Jr. (D-GA) Jan 12, 1933-Jan 21, 1971 38_00_1038 years, 10 days
14. LongRussell B. Long (D-LA) Dec 31, 1948-Jan 3, 1987 38_00_0338 years, 3 days
15. WarrenFrancis E. Warren (R-WY) Nov 18, 1890-Mar 3, 1893
and Mar 4, 1895-Nov 24, 1929
37_00_0437 years, 4 days
16. EastlandJames O. Eastland (D-MS) Jun 30, 1941-Sep 28, 1941
and Jan 3, 1943-Dec 27, 1978
36_02_2436 years, 2 months, 24 days
17. MagnusonWarren G. Magnuson (D-WA) Dec 14, 1944-Jan 3,1981 36_00_2036 years, 20 days
18. BidenJoe Biden (D-DE) Jan 3, 1973-Jan 15, 2009 36_00_1336 years, 13 days
19. DomeniciPete V. Domenici (R-NM) Jan 3, 1973-Jan 3, 2009 3636 years
19. LevinCarl Levin (D-MI) Jan 3, 1979-Jan 3, 2015 3636 years
19. LugarRichard G. Lugar (R-IN) Jan 3, 1977-Jan 3, 2013 3636 years
19. PellClaiborne Pell (D-RI) Jan 3, 1961-Jan 3, 1997 3636 years
23. McKellarKenneth D. McKellar (D-TN) Mar 4, 1917-Jan 3, 1953 35_10_0035 years, 10 months
24. YoungMilton R. Young (R-ND) Mar 12, 1945-Jan 3, 1981 35_09_2235 years, 9 months, 22 days
25. SmithEllison D. Smith (D-SC) Mar 4, 1909-Nov 17, 1944 35_08_1335 years, 8 months, 13 days