Senate Facts
Senate Facts
118th Congress: Senate Party Lineup
Senators up for re-election in 2026
Senate Order of Service
118th Congress: Senate Party Lineup
As of May 31, 2024:
Democrat: 47
Independent: 4 (For organizational purposes, Senators King, Manchin, Sanders and Sinema caucus with the Democrats)
Republican: 49
Senators up for re-election in 2026
Democrats (13)
- Cory Booker (New Jersey)
- Chris Coons (Delaware)
- Dick Durbin (Illinois)
- John Hickenlooper (Colorado)
- Ben Ray Lujan (New Mexico)
- Ed Markey (Massachusetts)
- Jeff Merkley (Oregon)
- Jon Ossoff (Georgia)
- Gary Peters (Michigan)
- Jack Reed (Rhode Island)
- Jean Shaheen (New Hampshire)
- Tina Smith (Minnesota)
- Mark Warner (Virginia)
Republicans (20)
- Shelly Moore Capito (West Virginia)
- Bill Cassidy (Louisiana)
- Susan Collins (Maine)
- John Cornyn (Texas)
- Tom Cotton (Arkansas)
- Steve Daines (Montana)
- Joni Ernst (Iowa)
- Lindsey Graham (South Carolina)
- Bill Hagerty (Tennessee)
- Cindy Hyde Smith (Mississippi)
- Cynthia Lummis (Wyoming)
- Roger Marshall (Kansas)
- Mitch McConnell (Kentucky)
- Markwayne Mullin (Oklahoma)
- Pete Ricketts (Nebraska)
- Jim Risch (Idaho)
- Mike Rounds (South Dakota)
- Dan Sullivan (Alaska)
- Thom Tillis (North Carolina)
- Tommy Tuberville (Alabama)
Senate Order of Service
From 1789 to 1958, senators whose terms began on the same day were listed alphabetically. Beginning in 1959, senators are listed according to commencement of first Senate term by order of service, determined by former service in order as senator, vice president, House member, cabinet secretary, governor, and then by state population. This latter system for calculating order of service has been used by the modern Senate for many years for the purposes of office assignment. It is unclear just when the Senate first began applying such criteria.
- Charles Grassley, R-Iowa, January 3, 1981
- Mitch McConnell, R-Kentucky, January 3, 1985
- Patty Murray, D-Washington, January 3, 1993
- Ron Wyden, D-Oregon, February 6, 1996
- Richard Durbin, D-Illinois, January 3, 1997
- Jack Reed, D-Rhode Island, January 3,1997
- Susan Collins, R-Maine, January 3, 1997
- Chuck Schumer, D-New York, January 3, 1999
- Michael Crapo, R-Idaho, January 3, 1999
- Thomas Carper, D-Delaware, January 3, 2001
- Debbie Stabenow, D-Michigan, January 3, 2001
- Maria Cantwell, D-Washington, January 3, 2001
- Lisa Murkowski, R-Alaska, December 20, 2002
- Lindsey Graham, R-South Carolina, January 3, 2003
- John Cornyn, R-Texas, December 2, 2002
- John Thune, R-South Dakota, January 3, 2005
- Benjamin L. Cardin, D-Maryland, January 3, 2007
- Bernie Sanders, I-Vermont, January 3, 2007
- Sherrod Brown, D-Ohio, January 3, 2007
- Bob Casey, D-Pennsylvania, January 3, 2007
- Amy Klobuchar, D-Minnesota, January 3, 2007
- Sheldon Whitehouse, D-Rhode Island, January 3, 2007
- Jon Tester, D-Montana, January 3, 2007
- John A. Barrasso, R-Wyoming, June 22, 2007
- Roger Wicker, R-Mississippi, December 31, 2007
- Jeanne Shaheen, D-New Hampshire, January 3, 2009
- Mark Warner, D-Virginia, January 3, 2009
- Jim Risch, R-Idaho, January 3, 2009
- Jeff Merkley, D-Oregon, January 3, 2009
- Michael Bennet, D-Colorado, January 22, 2009
- Kirsten Gillibrand, D-New York, January 27, 2009
- Joe Manchin, I-West Virginia, November 15, 2010
- Chris Coons, D-Delaware, November 15, 2010
- Jerry Moran, R-Kansas, January 3, 2011
- John Boozman, R-Arkansas, January 3, 2011
- John Hoeven, R-North Dakota, January 3, 2011
- Marco Rubio, R-Florida, January 3, 2011
- Ron Johnson, R-Wisconsin, January 3, 2011
- Rand Paul, R-Kentucky, January 3, 2011
- Richard Blumenthal, D-Connecticut, January 3, 2011
- Mike Lee, R-Utah, January 3, 2011
- Brian Schatz, D-Hawaii, December 27, 2012
- Tim Scott, R-South Carolina, January 3, 2013
- Tammy Baldwin, D-Wisconsin, January 3, 2013
- Chris Murphy, D-Connecticut, January 3, 2013
- Mazie Hirono, D-Hawaii, January 3, 2013
- Martin Heinrich, D-New Mexico, January 3, 2013
- Angus King, I-Maine, January 3, 2013
- Tim Kaine, D-Virginia, January 3, 2013
- Ted Cruz, R-Texas, January 3, 2013
- Elizabeth Warren, D-Massachusetts, January 3, 2013
- Deb Fischer, R-Nebraska, January 3, 2013
- Edward Markey, D-Massachusetts, July 16, 2013
- Cory Booker, D-New Jersey, October 31, 2013
- Shelley Moore Capito, R-West Virginia, January 3, 2015
- Gary Peters, D-Michigan, January 3, 2015
- Bill Cassidy, R-Louisiana, January 3, 2015
- James Lankford, R-Oklahoma, January 3, 2015
- Tom Cotton, R-Arkansas, January 3, 2015
- Steve Daines, R-Montana, January 3, 2015
- Mike Rounds, R-South Dakota, January 3, 2015
- Thom Tillis, R-North Carolina, January 3, 2015
- Joni Ernst, R-Iowa, January 3, 2015
- Dan Sullivan, R-Alaska, January 3, 2015
- Chris Van Hollen, D-Maryland, January 3, 2017
- Todd Young, R-Indiana, January 3, 2017
- Tammy Duckworth, D-Illinois, January 3, 2017
- Maggie Hassan, D-New Hampshire, January 3, 2017
- John Kennedy, R-Louisiana, January 3, 2017
- Catherine Cortez-Masto, D-Nevada, January 3, 2017
- Tina Smith, D-Minnesota, January 3, 2018
- Cindy Hyde Smith, R-Mississippi, April 9, 2018
- Marsha Blackburn, R-Tennessee, January 3, 2019
- Kyrsten Sinema, I-Arizona, January 3, 2019
- Kevin Cramer, R-North Dakota, January 3, 2019
- Jacky Rosen, D-Nevada, January 3, 2019
- Mitt Romney, R-Utah, January 3, 2019
- Mike Braun, R-Indiana, January 3, 2019
- Josh Hawley, R-Missouri, January 3, 2019
- Rick Scott, R-Florida, January 8, 2019
- Mark Kelly, D-Arizona, December 2, 2020
- Ben Ray Lujan, D-New Mexico, January 3, 2021
- Cynthia Lummis, R-Wyoming, January 3, 2021
- Roger Marshall, R-Kansas, January 3, 2021
- John Hickenlooper, D-Colorado, January 3, 2021
- Bill Hagerty, R-Tennessee, January 3, 2021
- Tommy Tuberville, R-Alabama, January 3, 2021
- Alex Padilla, D-California, January 20, 2021
- Jon Ossoff, D-Georgia, January 20, 2021
- Raphael Warnock D-Georgia, January 20, 2021
- Peter Welch D-Vermont, January 3, 2023
- Markwayne Mullin, R-Oklahoma, January 3, 2023
- Ted Budd, R-North Carolina, January 3, 2023
- John Fetterman, D- Pennsylvania, January 3, 2023
- JD Vance, R-Ohio, January 3, 2023
- Eric Schmitt, R-Missouri, January 3, 2023
- Katie Britt, R-Alabama, January 3, 2023
- Pete Ricketts, R-Nebraska, January 23, 2023
- Adam Schiff, D-California, December 9, 2024
- Andy Kim, D-New Jersey, December 9, 2024
As of May 31, 2024:
Democrat: 47
Independent: 4 (For organizational purposes, Senators King, Manchin, Sanders and Sinema caucus with the Democrats)
Republican: 49
Democrats (13)
- Cory Booker (New Jersey)
- Chris Coons (Delaware)
- Dick Durbin (Illinois)
- John Hickenlooper (Colorado)
- Ben Ray Lujan (New Mexico)
- Ed Markey (Massachusetts)
- Jeff Merkley (Oregon)
- Jon Ossoff (Georgia)
- Gary Peters (Michigan)
- Jack Reed (Rhode Island)
- Jean Shaheen (New Hampshire)
- Tina Smith (Minnesota)
- Mark Warner (Virginia)
Republicans (20)
- Shelly Moore Capito (West Virginia)
- Bill Cassidy (Louisiana)
- Susan Collins (Maine)
- John Cornyn (Texas)
- Tom Cotton (Arkansas)
- Steve Daines (Montana)
- Joni Ernst (Iowa)
- Lindsey Graham (South Carolina)
- Bill Hagerty (Tennessee)
- Cindy Hyde Smith (Mississippi)
- Cynthia Lummis (Wyoming)
- Roger Marshall (Kansas)
- Mitch McConnell (Kentucky)
- Markwayne Mullin (Oklahoma)
- Pete Ricketts (Nebraska)
- Jim Risch (Idaho)
- Mike Rounds (South Dakota)
- Dan Sullivan (Alaska)
- Thom Tillis (North Carolina)
- Tommy Tuberville (Alabama)
From 1789 to 1958, senators whose terms began on the same day are listed alphabetically. Beginning in 1959, senators are listed according to commencement of first Senate term by order of service, determined by former service in order as senator, vice president, House member, cabinet secretary, governor, and then by state population. This latter system for calculating order of service has been used by the modern Senate for many years for the purposes of office assignment. It is unclear just when the Senate first began applying such criteria.
- Charles Grassley, R-Iowa, January 3, 1981
- Mitch McConnell, R-Kentucky, January 3, 1985
- Patty Murray, D-Washington, January 3, 1993
- Ron Wyden, D-Oregon, February 6, 1996
- Richard Durbin, D-Illinois, January 3, 1997
- Jack Reed, D-Rhode Island, January 3,1997
- Susan Collins, R-Maine, January 3, 1997
- Chuck Schumer, D-New York, January 3, 1999
- Michael Crapo, R-Idaho, January 3, 1999
- Thomas Carper, D-Delaware, January 3, 2001
- Debbie Stabenow, D-Michigan, January 3, 2001
- Maria Cantwell, D-Washington, January 3, 2001
- Lisa Murkowski, R-Alaska, December 20, 2002
- Lindsey Graham, R-South Carolina, January 3, 2003
- John Cornyn, R-Texas, December 2, 2002
- John Thune, R-South Dakota, January 3, 2005
- Benjamin L. Cardin, D-Maryland, January 3, 2007
- Bernie Sanders, I-Vermont, January 3, 2007
- Sherrod Brown, D-Ohio, January 3, 2007
- Bob Casey, D-Pennsylvania, January 3, 2007
- Amy Klobuchar, D-Minnesota, January 3, 2007
- Sheldon Whitehouse, D-Rhode Island, January 3, 2007
- Jon Tester, D-Montana, January 3, 2007
- John A. Barrasso, R-Wyoming, June 22, 2007
- Roger Wicker, R-Mississippi, December 31, 2007
- Jeanne Shaheen, D-New Hampshire, January 3, 2009
- Mark Warner, D-Virginia, January 3, 2009
- Jim Risch, R-Idaho, January 3, 2009
- Jeff Merkley, D-Oregon, January 3, 2009
- Michael Bennet, D-Colorado, January 22, 2009
- Kirsten Gillibrand, D-New York, January 27, 2009
- Joe Manchin, D-West Virginia, November 15, 2010
- Chris Coons, D-Delaware, November 15, 2010
- Jerry Moran, R-Kansas, January 3, 2011
- John Boozman, R-Arkansas, January 3, 2011
- John Hoeven, R-North Dakota, January 3, 2011
- Marco Rubio, R-Florida, January 3, 2011
- Ron Johnson, R-Wisconsin, January 3, 2011
- Rand Paul, R-Kentucky, January 3, 2011
- Richard Blumenthal, D-Connecticut, January 3, 2011
- Mike Lee, R-Utah, January 3, 2011
- Brian Schatz, D-Hawaii, December 27, 2012
- Tim Scott, R-South Carolina, January 3, 2013
- Tammy Baldwin, D-Wisconsin, January 3, 2013
- Chris Murphy, D-Connecticut, January 3, 2013
- Mazie Hirono, D-Hawaii, January 3, 2013
- Martin Heinrich, D-New Mexico, January 3, 2013
- Angus King, I-Maine, January 3, 2013
- Tim Kaine, D-Virginia, January 3, 2013
- Ted Cruz, R-Texas, January 3, 2013
- Elizabeth Warren, D-Massachusetts, January 3, 2013
- Deb Fischer, R-Nebraska, January 3, 2013
- Edward Markey, D-Massachusetts, July 16, 2013
- Cory Booker, D-New Jersey, October 31, 2013
- Shelley Moore Capito, R-West Virginia, January 3, 2015
- Gary Peters, D-Michigan, January 3, 2015
- Bill Cassidy, R-Louisiana, January 3, 2015
- James Lankford, R-Oklahoma, January 3, 2015
- Tom Cotton, R-Arkansas, January 3, 2015
- Steve Daines, R-Montana, January 3, 2015
- Mike Rounds, R-South Dakota, January 3, 2015
- Thom Tillis, R-North Carolina, January 3, 2015
- Joni Ernst, R-Iowa, January 3, 2015
- Dan Sullivan, R-Alaska, January 3, 2015
- Chris Van Hollen, D-Maryland, January 3, 2017
- Todd Young, R-Indiana, January 3, 2017
- Tammy Duckworth, D-Illinois, January 3, 2017
- Maggie Hassan, D-New Hampshire, January 3, 2017
- John Kennedy, R-Louisiana, January 3, 2017
- Catherine Cortez-Masto, D-Nevada, January 3, 2017
- Tina Smith, D-Minnesota, January 3, 2018
- Cindy Hyde Smith, R-Mississippi, April 9, 2018
- Marsha Blackburn, R-Tennessee, January 3, 2019
- Kyrsten Sinema, I-Arizona, January 3, 2019
- Kevin Cramer, R-North Dakota, January 3, 2019
- Jacky Rosen, D-Nevada, January 3, 2019
- Mitt Romney, R-Utah, January 3, 2019
- Mike Braun, R-Indiana, January 3, 2019
- Josh Hawley, R-Missouri, January 3, 2019
- Rick Scott, R-Florida, January 8, 2019
- Mark Kelly, D-Arizona, December 2, 2020
- Ben Ray Lujan, D-New Mexico, January 3, 2021
- Cynthia Loomis, R-Wyoming, January 3, 2021
- Roger Marshall, R-Kansas, January 3, 2021
- John Hickenlooper, D-Colorado, January 3, 2021
- Bill Hagerty, R-Tennessee, January 3, 2021
- Tommy Tuberville, R-Alabama, January 3, 2021
- Alex Padilla, D-California, January 20, 2021
- Jon Ossoff, D-Georgia, January 20, 2021
- Raphael Warnock D-Georgia, January 20, 2021
- Peter Welch D-Vermont, January 3, 2023
- Markwayne Mullin, R-Oklahoma, January 3, 2023
- Ted Budd, R-North Carolina, January 3, 2023
- John Fetterman, D- Pennsylvania, January 3, 2023
- JD Vance, R-Ohio, January 3, 2023
- Eric Schmitt, R-Missouri, January 3, 2023
- Katie Britt, R-Alabama, January 3, 2023
- Pete Ricketts, R-Nebraska, January 23, 2023
- Adam Schiff, D-California, December 9, 2024
- Andy Kim, D-New Jersey, December 9, 2024