Who is the longest-serving U.S. Senator?

Chuck Grassley (Republican - IA) is the longest-serving current U.S. Senator, having served for approximately 45 years since January 3, 1981.

Who is the Dean of the U.S. Senate?

The Dean of the Senate is Chuck Grassley, the longest continuously serving member. The Dean is a ceremonial role with the privilege of swearing in the Vice President.

U.S. Senate Seniority List (119th Congress)

A ranking of all 100 current senators based on the length of their continuous service in the U.S. Senate. Seniority influences committee assignments and leadership roles.

Dean of the Senate (Longest Serving)

Chuck Grassley

Serving since January 3, 1981

Full Seniority Ranking

Rank	Senator	State	Service Started	Length of Service
1	Chuck Grassley	Iowa	January 3, 1981	45 years, 7 months
2	Mitch McConnell	Kentucky	January 3, 1985	41 years, 7 months
3	Patty Murray	Washington	January 3, 1993	33 years, 7 months
4	Ron Wyden	Oregon	February 6, 1996	30 years, 6 months
5	Susan Collins	Maine	January 3, 1997	29 years, 7 months
6	Dick Durbin	Illinois	January 3, 1997	29 years, 7 months
7	Jack Reed	Rhode Island	January 3, 1997	29 years, 7 months
8	Mike Crapo	Idaho	January 3, 1999	27 years, 7 months
9	Chuck Schumer	New York	January 3, 1999	27 years, 7 months
10	Maria Cantwell	Washington	January 3, 2001	25 years, 7 months
11	John Cornyn	Texas	December 2, 2002	23 years, 8 months
12	Lisa Murkowski	Alaska	December 20, 2002	23 years, 8 months
13	John Thune	South Dakota	January 3, 2005	21 years, 7 months
14	Amy Klobuchar	Minnesota	January 3, 2007	19 years, 7 months
15	Bernie Sanders	Vermont	January 3, 2007	19 years, 7 months
16	Sheldon Whitehouse	Rhode Island	January 3, 2007	19 years, 7 months
17	John Barrasso	Wyoming	June 22, 2007	19 years, 2 months
18	Roger Wicker	Mississippi	December 31, 2007	18 years, 7 months
19	Jeff Merkley	Oregon	January 3, 2009	17 years, 7 months
20	Jim Risch	Idaho	January 3, 2009	17 years, 7 months
21	Jeanne Shaheen	New Hampshire	January 3, 2009	17 years, 7 months
22	Mark Warner	Virginia	January 3, 2009	17 years, 7 months
23	Michael Bennet	Colorado	January 21, 2009	17 years, 7 months
24	Kirsten Gillibrand	New York	January 26, 2009	17 years, 7 months
25	Chris Coons	Delaware	November 15, 2010	15 years, 9 months
26	Richard Blumenthal	Connecticut	January 3, 2011	15 years, 7 months
27	John Boozman	Arkansas	January 3, 2011	15 years, 7 months
28	John Hoeven	North Dakota	January 3, 2011	15 years, 7 months
29	Ron Johnson	Wisconsin	January 3, 2011	15 years, 7 months
30	Mike Lee	Utah	January 3, 2011	15 years, 7 months
31	Jerry Moran	Kansas	January 3, 2011	15 years, 7 months
32	Rand Paul	Kentucky	January 3, 2011	15 years, 7 months
33	Brian Schatz	Hawaii	December 26, 2012	13 years, 8 months
34	Tim Scott	South Carolina	January 2, 2013	13 years, 7 months
35	Tammy Baldwin	Wisconsin	January 3, 2013	13 years, 7 months
36	Ted Cruz	Texas	January 3, 2013	13 years, 7 months
37	Deb Fischer	Nebraska	January 3, 2013	13 years, 7 months
38	Martin Heinrich	New Mexico	January 3, 2013	13 years, 7 months
39	Mazie Hirono	Hawaii	January 3, 2013	13 years, 7 months
40	Tim Kaine	Virginia	January 3, 2013	13 years, 7 months
41	Angus King	Maine	January 3, 2013	13 years, 7 months
42	Chris Murphy	Connecticut	January 3, 2013	13 years, 7 months
43	Elizabeth Warren	Massachusetts	January 3, 2013	13 years, 7 months
44	Ed Markey	Massachusetts	July 16, 2013	13 years, 1 month
45	Cory Booker	New Jersey	October 31, 2013	12 years, 9 months
46	Shelley Capito	West Virginia	January 3, 2015	11 years, 7 months
47	Bill Cassidy	Louisiana	January 3, 2015	11 years, 7 months
48	Tom Cotton	Arkansas	January 3, 2015	11 years, 7 months
49	Steve Daines	Montana	January 3, 2015	11 years, 7 months
50	Joni Ernst	Iowa	January 3, 2015	11 years, 7 months
51	James Lankford	Oklahoma	January 3, 2015	11 years, 7 months
52	Gary Peters	Michigan	January 3, 2015	11 years, 7 months
53	Mike Rounds	South Dakota	January 3, 2015	11 years, 7 months
54	Dan Sullivan	Alaska	January 3, 2015	11 years, 7 months
55	Thom Tillis	North Carolina	January 3, 2015	11 years, 7 months
56	Catherine Cortez Masto	Nevada	January 3, 2017	9 years, 7 months
57	Tammy Duckworth	Illinois	January 3, 2017	9 years, 7 months
58	Maggie Hassan	New Hampshire	January 3, 2017	9 years, 7 months
59	John Kennedy	Louisiana	January 3, 2017	9 years, 7 months
60	Chris Van Hollen	Maryland	January 3, 2017	9 years, 7 months
61	Todd Young	Indiana	January 3, 2017	9 years, 7 months
62	Tina Smith	Minnesota	January 3, 2018	8 years, 7 months
63	Cindy Hyde-Smith	Mississippi	April 2, 2018	8 years, 4 months
64	Marsha Blackburn	Tennessee	January 3, 2019	7 years, 7 months
65	Kevin Cramer	North Dakota	January 3, 2019	7 years, 7 months
66	Josh Hawley	Missouri	January 3, 2019	7 years, 7 months
67	Jacky Rosen	Nevada	January 3, 2019	7 years, 7 months
68	Rick Scott	Florida	January 8, 2019	7 years, 7 months
69	Mark Kelly	Arizona	December 2, 2020	5 years, 8 months
70	Bill Hagerty	Tennessee	January 3, 2021	5 years, 7 months
71	John Hickenlooper	Colorado	January 3, 2021	5 years, 7 months
72	Ben Luján	New Mexico	January 3, 2021	5 years, 7 months
73	Cynthia Lummis	Wyoming	January 3, 2021	5 years, 7 months
74	Roger Marshall	Kansas	January 3, 2021	5 years, 7 months
75	Tommy Tuberville	Alabama	January 3, 2021	5 years, 7 months
76	Alex Padilla	California	January 18, 2021	5 years, 7 months
77	Jon Ossoff	Georgia	January 20, 2021	5 years, 7 months
78	Raphael Warnock	Georgia	January 20, 2021	5 years, 7 months
79	Katie Britt	Alabama	January 3, 2023	3 years, 7 months
80	Ted Budd	North Carolina	January 3, 2023	3 years, 7 months
81	John Fetterman	Pennsylvania	January 3, 2023	3 years, 7 months
82	Eric Schmitt	Missouri	January 3, 2023	3 years, 7 months
83	Peter Welch	Vermont	January 3, 2023	3 years, 7 months
84	Pete Ricketts	Nebraska	January 12, 2023	3 years, 7 months
85	Andy Kim	New Jersey	December 8, 2024	1 year, 8 months
86	Adam Schiff	California	December 8, 2024	1 year, 8 months
87	Angela Alsobrooks	Maryland	January 3, 2025	1 year, 7 months
88	Jim Banks	Indiana	January 3, 2025	1 year, 7 months
89	Lisa Blunt Rochester	Delaware	January 3, 2025	1 year, 7 months
90	John Curtis	Utah	January 3, 2025	1 year, 7 months
91	Ruben Gallego	Arizona	January 3, 2025	1 year, 7 months
92	David McCormick	Pennsylvania	January 3, 2025	1 year, 7 months
93	Bernie Moreno	Ohio	January 3, 2025	1 year, 7 months
94	Tim Sheehy	Montana	January 3, 2025	1 year, 7 months
95	Elissa Slotkin	Michigan	January 3, 2025	1 year, 7 months
96	Jim Justice	West Virginia	January 14, 2025	1 year, 7 months
97	Jon Husted	Ohio	January 18, 2025	1 year, 7 months
98	Ashley Moody	Florida	January 21, 2025	1 year, 7 months
99	Alan Armstrong	Oklahoma	March 24, 2026	5 months, 6 days
100	Darline Graham Nordone	South Carolina	July 14, 2026	1 month, 16 days