Highlights on Longest-serving U.S. Senators



CNN

Here is a look at the 25 longest serving senators in United States history. Although not in the top 25, Dianne Fienstein is the longest-serving senator in history. She celebrated her 30th birthday in the Senate in 2022.

Names in bold currently serve in the US Senate.

1) Robert C. Byrd (D-WV), 51 years, 5 months, 26 days
January 3, 1959 – June 28, 2010

2) Daniel K. Inouye (D-HI), 49 years, 11 months, 15 days
January 3, 1963 – December 17, 2012

3) Patrick Leahy (D-VT), 47 years, 7 months, 22 days
January 3, 1975–present

4) Strom Thurmond (R-SC), 47 years, 5 months, 8 days
December 14, 1954-April 4, 1956 and November 7, 1956-January 3, 2003

5) Edward M. Kennedy (D-MA), 46 years, 9 months, 19 days
November 7, 1962 – his death on August 25, 2009

6) Orrin Hatch (R-UT), 42
January 3, 1977-January 3, 2019

7) Carl T. Hayden (D-AZ), 41 years, 9 months, 30 days
March 4, 1927 – January 3, 1969

8) Charles E. Grassley (R-IA), 41 years, 7 months, 22 days
January 3, 1981–present

9) John C. Stennis (D-MS), 41 years, 1 month, 29 days
November 5, 1947 – January 3, 1989

10) Theodore F. Stevens (R-AK), 40 years, 10 days
December 24, 1968 – January 3, 2009

11) Thad Cochran (R-MS), 39, 3 months, 6 days
December 27, 1978-April 1, 2018

12) Ernest F. Hollings (D-SC), 38 years, 1 month, 25 days
November 9, 1966 – January 3, 2005

13) Richard B. Russell (D-GA), 38, 10 days
January 12, 1933 – January 21, 1971

14) Russell Long (D-LA), 38, 3 days
December 31, 1948 – January 3, 1987

15) Mitch McConnell (R-KY), 37 years, 7 months, 22 days
January 3, 1985–present

16) Francis E. Warren (R-WY), 37, 4 days
November 18, 1890 – March 3, 1893 and March 4, 1895 – November 24, 1929

17) James O. Eastland (D-MS), 36 years, 2 months, 24 days
June 30, 1941 – September 28, 1941 and January 3, 1943 – December 27, 1978

18) Warren Magnuson (D-WA), 36, 20 days
December 14, 1944 – January 3, 1981

19) Joe Biden (D-DE), 36 years, 13 days
January 3, 1973 – January 15, 2009

20) Pete V. Domenici (R-NM), 36
January 3, 1973 – January 3, 2009

20) Carl Levin (D-MI), 36
January 3, 1979 – January 3, 2015

20) Richard Lugar (R-IN), 36
January 3, 1977 – January 3, 2013

20) Claiborne Pell (D-RI), 36
January 3, 1961 – January 3, 1997

24) Kenneth McKellar (D-TN), 35, 10 months
March 4, 1917 – January 3, 1953

25) Milton R. Young (R-ND), 35 years, 9 months, 22 days
March 12, 1945 – January 3, 1981


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