Statistics for Longest Serving U.S. Senators

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Rank	Dates of Service	State	Senator	% Correct
3	Dec 14, 1954-Apr 4, 1956 and Nov 7, 1956-Jan 3, 2003	South Carolina	Strom Thurmond	91%
4	Nov 7, 1962-Aug 25, 2009	Massachusetts	Ted Kennedy	86%
1	Jan 3, 1959-Jun 28, 2010	West Virginia	Robert Byrd	82%
11	Jan 3, 1981 - Present	Iowa	Chuck Grassley	77%
2	Jan 3, 1963-Dec 17, 2012	Hawaii	Daniel Inouye	70%
5	Jan 3, 1975-present	Vermont	Patrick Leahy	70%
18	Jan 3, 1973-Jan 15, 2009	Delaware	Joe Biden	66%
6	Jan 3, 1977-Jan 3, 2019	Utah	Orrin Hatch	66%
9	Dec 24, 1968-Jan 3, 2009	Alaska	Ted Stevens	55%
14	Dec 31, 1948-Jan 3, 1987	Louisiana	Russell B. Long	41%
10	Dec 27, 1978-Apr 1, 2018	Mississippi	Thad Cochran	30%
12	Nov 9, 1966-Jan 3, 2005	South Carolina	Fritz Hollings	27%
19	Jan 3, 1977-Jan 3, 2013	Indiana	Richard Lugar	27%
25	Mar 4, 1909-Nov 17, 1944	South Carolina	Ellison D. Smith	25%
7	Mar 4, 1927-Jan 3, 1969	Arizona	Carl Hayden	23%
19	Jan 3, 1979-Jan 3, 2015	Michigan	Carl Levin	23%
8	Nov 5, 1947-Jan 3, 1989	Mississippi	John C. Stennis	23%
19	Jan 3, 1961-Jan 3, 1997	Rhode Island	Claiborne Pell	21%
13	Jan 12, 1933-Jan 21, 1971	Georgia	Richard Russell, Jr.	21%
16	Jun 30, 1941-Sep 28, 1941 and Jan 3, 1943-Dec 27, 1978	Mississippi	James Eastland	20%
24	Mar 12, 1945-Jan 3, 1981	North Dakota	Milton Young	20%
19	Jan 3, 1973-Jan 3, 2009	New Mexico	Pete Domenici	20%
17	Dec 14, 1944-Jan 3,1981	Washington	Warren Magnuson	14%
23	Mar 4, 1917-Jan 3, 1953	Tennessee	Kenneth McKellar	9%
15	Nov 18, 1890-Mar 3, 1893 and Mar 4, 1895-Nov 24, 1929	Wyoming	Francis E. Warren	7%