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Office		Reason for Open Chair or Seat
		Voluntary	Term Limit	Vacant	Lost Primary	Total
Senator	Republican	4	0	0	0	4
Congressman	Republican	34	0	2	2	38
	Democratic	20	0	0	1	21
Governor	Democratic	2	3	0	0	5
	Republican	3	11	0	1	15
Totals		63	14	2	4	83

 

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Arizona

• Senate Class 1
  • Republican - Senator Jeff Flake
  • Open Seat. 24 October 2017: Will not seek re-election in 2018.
• House CD 2
  • Republican - Congressman Martha E. McSally
  • Open Seat. 12 January 2018: Ran for and won her party's nomination for Senate Class 1 seat in 2018.
• House CD 9
  • Democratic - Congressman Kyrsten Sinema
  • Open Seat. 28 September 2017: Ran for and won his party's nomination for the Senate Class 1 Seat in 2018.

California

• Governor
  • Democratic - Governor Edmund G. "Jerry" Brown, Jr.
  • Open Chair. Term Limit.
• House CD 39
  • Republican - Congressman Edward R. "Ed" Royce
  • Open Seat. 8 January 2018: "I have decided not to seek reelection in November."
• House CD 49
  • Republican - Congressman Darrell Edward Issa
  • Open Seat. 10 January 2018: "I have decided that I will not seek re-election." 19 September 2018: Nominated by President Trump for the position of U.S. Trade and Development Agency Director.

Colorado

• Governor
  • Democratic - Governor John W. Hickenlooper
  • Open Chair. Term Limit.
• House CD 2
  • Democratic - Congressman Jared Polis
  • Open Seat. 11 June 2017: Candidate for Governor in 2018.

Connecticut

• Governor
  • Democratic - Governor Dannel P. "Dan" Malloy
  • Open Chair. 13 April 2017: Will not run for re-election in 2018.
• House CD 5
  • Democratic - Congressman Elizabeth H. Esty
  • Open Seat. 2 April 2018: "... I have determined that it is in the best interest of my constituents and my family to end my time in Congress at the end of this year and not seek re-election."

Florida

• Governor
  • Republican - Governor Richard L. "Rick" Scott
  • Open Chair. Term Limit. Running for the U.S. Senate Class 1 office in 2018.
• House CD 6
  • Republican - Congressman Ronald D. "Ron" DeSantis
  • Vacant Office. 5 January 2018: Candidate for Governor in 2018. 10 September 2018: Resigned. "As the Republican nominee for Governor of Florida, it is clear to me that I will likely miss the ... majority of our remaining session days ... I officially resign from the House of Representatives effective immediately ... I ask that my resignation be retroactive to September 1 ..."
• House CD 15
  • Republican - Congressman Dennis Alan Ross
  • Open Seat. 11 April 2018: Announced retirement.
• House CD 17
  • Republican - Congressman Thomas Joseph "Tom" Rooney
  • Open Seat. 19 February 2018: "I will not be running for re-election to Congress in 2018."
• House CD 27
  • Republican - Congressman Ileana Ros-Lehtinen
  • Open Seat. 30 April 2017: Not running for re-election.

Georgia

• Governor
  • Republican - Governor John Nathan "Nathan" Deal
  • Open Chair. Term Limit.

Hawaii

• House CD 1
  • Democratic - Congressman Colleen Wakako Hanabusa
  • Open Seat. 1 September 2017: Ran for but lost her party's nomination for Governor in 2018.

Idaho

• Governor
  • Republican - Governor C.L. "Butch" Otter
  • Open Chair. 14 October 2014: "Won't run for a fourth term" in 2018.
• House CD 1
  • Republican - Congressman Raúl Rafael Labrador
  • Open Seat. Ran for but lost his party's nomination for Governor in 2018.

Illinois

• House CD 4
  • Democratic - Congressman Luis V. Gutierrez
  • Open Seat. 28 November 2017: "Will not be seeking re-election...."

Indiana

• House CD 4
  • Republican - Congressman Theodore Edward "Todd" Rokita
  • Open Seat. 9 August 2017: Ran for but lost the primary for the Senate Class 1 seat in 2018.
• House CD 6
  • Republican - Congressman Allen Lucas "Luke" Messer
  • Open Seat. 26 July 2017: Ran for but lost the primary for the Class 1 Senate Seat in 2018.

Kansas

• Governor
  • Republican - Governor Jeff Colyer
  • Lost Primary / No Longer Running.
• House CD 2
  • Republican - Congressman Lynn Jenkins
  • Open Seat. 25 January 2017: "I will not be running for any office in 2018."

Maine

• Governor
  • Republican - Governor Paul R. LePage
  • Open Chair. Term Limit.

Maryland

• House CD 6
  • Democratic - Congressman John K. Delaney
  • Open Seat. 27 July 2017: Not running for re-election.

Massachusetts

• House CD 3
  • Democratic - Congressman Nicola S. "Niki" Tsongas
  • Open Seat. 9 August 2017: Not running for re-election.
• House CD 7
  • Democratic - Congressman Michael E. "Mike" Capuano
  • Lost Primary / No Longer Running.

Michigan

• Governor
  • Republican - Governor Richard D. "Rick" Snyder
  • Open Chair. Term Limit.
• House CD 9
  • Democratic - Congressman Sander Martin "Sandy" Levin
  • Open Seat. 2 December 2017: Announced retirement.
• House CD 11
  • Republican - Congressman David A. "Dave" Trott
  • Open Seat. 11 September 2017: House CD 11 Trott "I have decided not seek re-election in 2018".
• House CD 13
  • Democratic - Congressman Brenda Jones
  • Open Seat.

Minnesota

• Governor
  • Democratic - Governor Mark Dayton
  • Open Chair. 21 November 2016: Retiring at the end of his term.
• House CD 1
  • Democratic - Congressman Timothy J. "Tim" Walz
  • Open Seat. 27 March 2017: Candidate for Governor
• House CD 5
  • Democratic - Congressman Keith Maurice Ellison
  • Open Seat. 5 June 2018: Candidate for Attorney General in 2018.
• House CD 8
  • Democratic - Congressman Richard Michael "Rick" Nolan
  • Open Seat. 9 February 2018: "... I am announcing today that I will not be a candidate for reelection, and will retire at the end of the current term." 3 June 2018: Ran for but did not receive his party's nomination for Lieutenant Governor.

Mississippi

• Governor
  • Republican - Governor Phil Bryant
  • Open Chair. Term Limit. At term limit.
• House CD 3
  • Republican - Congressman Gregg Harper
  • Open Seat. 4 January 2018: Not seeking re-election.

Montana

• Governor
  • Democratic - Governor Steve Bullock
  • Open Chair. Term Limit. At term limit

Nevada

• Governor
  • Republican - Governor Brian E. Sandoval
  • Open Chair. Term Limit.
• House CD 3
  • Democratic - Congressman Jacklyn S. "Jacky" Rosen
  • Open Seat. Running for the U.S. Senate Class 1 seat in 2018.
• House CD 4
  • Democratic - Congressman Ruben Jesus Kihuen
  • Open Seat. aka Ruben Jesus Kihuen Bernal

New Hampshire

• House CD 1
  • Democratic - Congressman Carol Shea-Porter
  • Open Seat. 5 October 2017: "... I am announcing my intention to leave the House of Representatives in January 2019, when my present term ends."

New Jersey

• House CD 2
  • Republican - Congressman Frank A. LoBiondo
  • Open Seat. 7 November 2017: Will not seek re-election.
• House CD 11
  • Republican - Congressman Rodney P. Frelinghuysen
  • Open Seat. 29 January 2018: Announced that he would not run for re-election.

New Mexico

• Governor
  • Republican - Governor Susana Martinez
  • Open Chair. Term Limit.
• House CD 1
  • Democratic - Congressman Michelle Lujan Grisham
  • Open Seat. 13 December 2016: Announced run for Governor in 2016.
• House CD 2
  • Republican - Congressman Stevan E. "Steve" Pearce
  • Open Seat. 10 July 2017: Candidate for Governor in 2018. 6 November 2018: Lost his bid for Governor.

North Carolina

• House CD 9
  • Republican - Congressman Robert Matthew Pittenger
  • Lost Primary / No Longer Running. Mark Everette Harris (Republican) was not sworn into the 116th Congress on 3 January 2019. This contest was not certified due to irregularities in Bladen and Robeson Counties involving requests for absentee ballots, unreturned absentee ballots, and individuals who illegally collected absentee ballots. On 6 December 2018, Dan McCready (Democratic) announced that he is withdrawing his concession.

North Dakota

• House At-Large
  • Republican - Congressman Kevin Cramer
  • Open Seat. 15 February 2018: Sent a Facebook invite for a "Cramer for Senate Announcement & Rally".

Ohio

• Governor
  • Republican - Governor John Richard Kasich
  • Open Chair. Term Limit.
• House CD 16
  • Republican - Congressman James B. "Jim" Renacci
  • Open Seat. 20 March 2017: Running for Governor in 2018. 11 January 2018: Running for the Class 1 Senate Seat in 2018.

Oklahoma

• Governor
  • Republican - Governor Mary C. Fallin
  • Open Chair. Term Limit.

Pennsylvania

• House CD 1
  • Democratic - Congressman Robert A. "Bob" Brady
  • Open Seat. 31 January 2018: Announced he would not seek re-election.
• House CD 6
  • Republican - Congressman Ryan A. Costello
  • Open Seat. 24 March 2018: Will not seek re-election.
• House CD 7
  • Democratic - Congressman Mary Gay Scanlon
  • Open Seat.
• House CD 9
  • Republican - Congressman William Franklin "Bill" Shuster
  • Open Seat. 2 January 2018: Announced retirement
• House CD 11
  • Republican - Congressman Louis J. "Lou" Barletta
  • Open Seat. 28 August 2017: Ran for but the Class 1 Senate Seat in 2018.

South Carolina

• House CD 1
  • Republican - Congressman Marshall Clement "Mark" Sanford, Jr.
  • Lost Primary / No Longer Running.
• House CD 4
  • Republican - Congressman Harold W. "Trey" Gowdy, III
  • Open Seat. 31 January 2018: "... This is the right time, for me, to leave politics and return to the justice system...."

South Dakota

• Governor
  • Republican - Governor Dennis M. Daugaard
  • Open Chair. Term Limit.
• House At-Large
  • Republican - Congressman Kristi Lynn Noem
  • Open Seat. 14 November 2016: Candidate for Governor in 2018.

Tennessee

• Senate Class 1
  • Republican - Senator Robert P. "Bob" Corker, Jr.
  • Open Seat. 26 September 2017: "After much thought, consideration and family discussion ... I have decided that I will leave the United States Senate when my term expires ...."
• Senate Class 2
  • Republican - Senator Lamar Alexander
  • Open Seat. 18 December 2018: "I will not be a candidate for re-election to the United States Senate in 2020."
• Governor
  • Republican - Governor William "Bill" Haslam
  • Open Chair. Term Limit.
• House CD 2
  • Republican - Congressman John J. Duncan, Jr.
  • Open Seat. 31 July 2017: Announced that he would not seek re-election.
• House CD 6
  • Republican - Congressman Diane Lynn Black
  • Open Seat. 2 August 2017: Ran for but lost her party's nomination for Governor in 2018.
• House CD 7
  • Republican - Congressman Marsha Blackburn
  • Open Seat. 4 October 2017: Running for the Class 1 Senate Seat in 2018. 2 August 2018: Received her party's nomination for the Class 1 Senate Seat.

Texas

• House CD 2
  • Republican - Congressman Lloyd "Ted" Poe
  • Open Seat. 7 November 2017: "I will continue this work every day until I retire at the end of this term...."
• House CD 3
  • Republican - Congressman Samuel Robert "Sam" Johnson
  • Open Seat. 6 January 2017: Announced he won't seek re-election.
• House CD 5
  • Republican - Congressman Jeb Hensarling
  • Open Seat. 31 October 2017: "Today I am announcing that I will not seek reelection to the U.S. Congress in 2018."
• House CD 6
  • Republican - Congressman Joe Linus Barton
  • Open Seat. 30 November 2017: "I am announcing today that I will not seek reelection in 2018...."
• House CD 16
  • Democratic - Congressman Robert "Beto" O'Rourke
  • Open Seat. 31 March 2017: Announced that he is running for the U.S. Senate Class I seat in 2018.
• House CD 21
  • Republican - Congressman Lamar Seeligson Smith
  • Open Seat. 2 November 2017: "For several reasons, this seems like a good time to pass on the privilege of representing the 21st District to someone else...."
• House CD 29
  • Democratic - Congressman Raymond Eugene "Gene" Green
  • Open Seat. 13 November 2017: "I have decided to not seek reelection for Representative of Texas' 29th Congressional District. It has been an honor serving #TX29 since I was first elected in 1992."

Utah

• Senate Class 1
  • Republican - Senator Orrin G. Hatch
  • Open Seat. 02 January 2018: "I've decided to retire at the end of this term...."
• Governor
  • Republican - Governor Gary R. Herbert
  • Open Chair.

Virginia

• House CD 5
  • Republican - Congressman Thomas Alexander "Tom" Garrett, Jr.
  • Open Seat. 28 May 2018: Announced retirement. Nominations-- Democrats will nominate by Convention on 5 May. Republicans 1 candidate. Since the announcement of the retirement of Congressman Thomas Alexander "Tom" Garrett, Jr. (Republican) came after the filing deadline, the 5th Congressional District Republican Committee will choose a replacement nominee on Saturday 2 June 2018. The Committee chose Denver Riggleman.
• House CD 6
  • Republican - Congressman Robert William "Bob" Goodlatte
  • Open Seat. 9 November 2017: "I cannot begin to express how blessed I am to have had the opportunity to serve. Now is the right time to step aside - I will not seek re-election." Nominations-- Democrats will nominate by Primary. Republicans will nominate by Convention on 19 May.

Washington

• House CD 8
  • Republican - Congressman Dave Reichert
  • Open Seat. 6 September 2017: Not a candidate for re-election.

West Virginia

• House CD 3
  • Republican - Congressman Evan H. Jenkins
  • Vacant Office. 8 May 2017: Lost the primary for the U.S. Senate Class 2 seat in 2018. Now running for state Supreme Court Justice. 25 August 2018: Governor Jim Justice has names Congressman Evan Jenkins to the state Supreme Court. The Congressman will resign from Congress when he takes the bench. 28 August 2018: There will be no special election according to the Secretary of State. Once Congressman Jenkins resigns, the seat will remain vacant until the successor is seated on 3 January 2019. 30 September 2018: Resigned.

Wisconsin

• House CD 1
  • Republican - Congressman Paul D. Ryan
  • Open Seat. 3 January 2017: Elected Speaker of the House. 11 April 2018: Not running for re-election.

Wyoming

• Governor
  • Republican - Governor Matt Mead
  • Open Chair. 7 February 2017: Will not run for re-election in 2018.

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