|Incumbent||Party||Office||Reason for not seeking re-election|
|Senator Jeff Flake||Republican||Senate Class 1||Open Seat. 24 October 2017: Will not seek re-election in 2018.|
|Senator Jon Llewellyn Kyl||Republican||Senate Class 3||Open Seat. "I will not seek this office in 2020 or any other higher office in the future."|
|Congressman Martha E. McSally||Republican||House CD 2||Open Seat. 12 January 2018: Ran for and won her party's nomination for Senate Class 1 seat in 2018.|
|Congressman Kyrsten Sinema||Democratic||House CD 9||Open Seat. 28 September 2017: Ran for and won his party's nomination for the Senate Class 1 Seat in 2018.|
|Governor Edmund G. "Jerry" Brown, Jr.||Democratic||Governor||Open Chair. Term Limit|
|Congressman Edward R. "Ed" Royce||Republican||House CD 39||Open Seat. 8 January 2018: "I have decided not to seek reelection in November."|
|Congressman Darrell Edward Issa||Republican||House CD 49||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.
|Governor John W. Hickenlooper||Democratic||Governor||Open Chair. Term Limit|
|Congressman Jared Polis||Democratic||House CD 2||Open Seat. 11 June 2017: Candidate for Governor in 2018.|
|Governor Dannel P. "Dan" Malloy||Democratic||Governor||Open Chair. 13 April 2017: Will not run for re-election in 2018.|
|Congressman Elizabeth H. Esty||Democratic||House CD 5||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."|
|Governor Richard L. "Rick" Scott||Republican||Governor||Open Chair. Term Limit. Running for the U.S. Senate Class 1 office in 2018.|
|Congressman Ronald D. "Ron" DeSantis||Republican||House CD 6||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 ..."
|Congressman Dennis Alan Ross||Republican||House CD 15||Open Seat. 11 April 2018: Announced retirement.|
|Congressman Thomas Joseph "Tom" Rooney||Republican||House CD 17||Open Seat. 19 February 2018: "I will not be running for re-election to Congress in 2018."|
|Congressman Ileana Ros-Lehtinen||Republican||House CD 27||Open Seat. 30 April 2017: Not running for re-election.|
|Governor John Nathan "Nathan" Deal||Republican||Governor||Open Chair. Term Limit|
|Congressman Colleen Wakako Hanabusa||Democratic||House CD 1||Open Seat. 1 September 2017: Ran for but lost her party's nomination for Governor in 2018.|
|Governor C.L. "Butch" Otter||Republican||Governor||Open Chair. 14 October 2014: "Won't run for a fourth term" in 2018.|
|Congressman Raúl Rafael Labrador||Republican||House CD 1||Open Seat. Ran for but lost his party's nomination for Governor in 2018.|
|Congressman Luis V. Gutierrez||Democratic||House CD 4||Open Seat. 28 November 2017: "Will not be seeking re-election...."|
|Congressman Theodore Edward "Todd" Rokita||Republican||House CD 4||Open Seat. 9 August 2017: Ran for but lost the primary for the Senate Class 1 seat in 2018.|
|Congressman Allen Lucas "Luke" Messer||Republican||House CD 6||Open Seat. 26 July 2017: Ran for but lost the primary for the Class 1 Senate Seat in 2018.|
|Governor Jeff Colyer||Republican||Governor||Lost Primary / No Longer Running|
|Congressman Lynn Jenkins||Republican||House CD 2||Open Seat. 25 January 2017: "I will not be running for any office in 2018."|
|Governor Paul R. LePage||Republican||Governor||Open Chair. Term Limit|
|Congressman John K. Delaney||Democratic||House CD 6||Open Seat. 27 July 2017: Not running for re-election.|
|Congressman Nicola S. "Niki" Tsongas||Democratic||House CD 3||Open Seat. 9 August 2017: Not running for re-election.|
|Congressman Michael E. "Mike" Capuano||Democratic||House CD 7||Lost Primary / No Longer Running|
|Governor Richard D. "Rick" Snyder||Republican||Governor||Open Chair. Term Limit|
|Congressman Sander Martin "Sandy" Levin||Democratic||House CD 9||Open Seat. 2 December 2017: Announced retirement.|
|Congressman David A. "Dave" Trott||Republican||House CD 11||Open Seat. 11 September 2017: House CD 11 Trott "I have decided not seek re-election in 2018".|
|Congressman Brenda Jones||Democratic||House CD 13||Open Seat|
|Governor Mark Dayton||Democratic||Governor||Open Chair. 21 November 2016: Retiring at the end of his term.|
|Congressman Timothy J. "Tim" Walz||Democratic||House CD 1||Open Seat. 27 March 2017: Candidate for Governor|
|Congressman Keith Maurice Ellison||Democratic||House CD 5||Open Seat. 5 June 2018: Candidate for Attorney General in 2018.|
|Congressman Richard Michael "Rick" Nolan||Democratic||House CD 8||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.
|Governor Phil Bryant||Republican||Governor||Open Chair. Term Limit. At term limit.|
|Congressman Gregg Harper||Republican||House CD 3||Open Seat. 4 January 2018: Not seeking re-election.|
|Governor Steve Bullock||Democratic||Governor||Open Chair. Term Limit. At term limit|
|Governor Brian E. Sandoval||Republican||Governor||Open Chair. Term Limit|
|Congressman Jacklyn S. "Jacky" Rosen||Democratic||House CD 3||Open Seat. Running for the U.S. Senate Class 1 seat in 2018.|
|Congressman Ruben Jesus Kihuen||Democratic||House CD 4||Open Seat. |
aka Ruben Jesus Kihuen Bernal
|Congressman Carol Shea-Porter||Democratic||House CD 1||Open Seat. 5 October 2017: "... I am announcing my intention to leave the House of Representatives in January 2019, when my present term ends."|
|Congressman Frank A. LoBiondo||Republican||House CD 2||Open Seat. 7 November 2017: Will not seek re-election.|
|Congressman Rodney P. Frelinghuysen||Republican||House CD 11||Open Seat. 29 January 2018: Announced that he would not run for re-election.|
|Governor Susana Martinez||Republican||Governor||Open Chair. Term Limit|
|Congressman Michelle Lujan Grisham||Democratic||House CD 1||Open Seat. 13 December 2016: Announced run for Governor in 2016.|
|Congressman Stevan E. "Steve" Pearce||Republican||House CD 2||Open Seat. 10 July 2017: Candidate for Governor in 2018.|
6 November 2018: Lost his bid for Governor.
|Congressman Robert Matthew Pittenger||Republican||House CD 9||Lost Primary / No Longer Running. |
This contest was not certified due to irregularities in Bladen County involving requests for absentee ballots, unreturned absentee ballots, and individuals who illegally collected absentee ballots. An evidentiary hearing is scheduled circa 21 December 2018. On 6 December 2018, Dan McCready (Democratic) announced that he is withdrawing his concession. The unofficial results are Mark Everette Harris (Republican) 139,246 votes, 49.25%; Daniel Kent "Dan" McCready (Democratic) 138,341 votes, 48.93%; Jeffery "Jeff" Scott (Libertarian) 5,130 votes, 1.81%.
|Congressman Kevin Cramer||Republican||House At-Large||Open Seat. 15 February 2018: Sent a Facebook invite for a "Cramer for Senate Announcement & Rally".|
|Governor John Richard Kasich||Republican||Governor||Open Chair. Term Limit|
|Congressman James B. "Jim" Renacci||Republican||House CD 16||Open Seat. 20 March 2017: Running for Governor in 2018.|
11 January 2018: Running for the Class 1 Senate Seat in 2018.
|Governor Mary C. Fallin||Republican||Governor||Open Chair. Term Limit|
|Congressman James Frederick "Jim" Bridenstine||Republican||House CD 1||Vacant Office. Not running for re-election in 2018.|
1 September 2017: Congressman Jim Bridenstine was nominated by President Trump to be Administrator of the National Aeronautics and Space Administration.
23 April 2018: Resigned.
|Congressman Robert A. "Bob" Brady||Democratic||House CD 1||Open Seat. 31 January 2018: Announced he would not seek re-election.|
|Congressman Ryan A. Costello||Republican||House CD 6||Open Seat. 24 March 2018: Will not seek re-election.|
|Congressman Mary Gay Scanlon||Democratic||House CD 7||Open Seat|
|Congressman William Franklin "Bill" Shuster||Republican||House CD 9||Open Seat. 2 January 2018: Announced retirement|
|Congressman Louis J. "Lou" Barletta||Republican||House CD 11||Open Seat. 28 August 2017: Ran for but the Class 1 Senate Seat in 2018.|
|Congressman Marshall Clement "Mark" Sanford, Jr.||Republican||House CD 1||Lost Primary / No Longer Running|
|Congressman Harold W. "Trey" Gowdy, III||Republican||House CD 4||Open Seat. 31 January 2018: "... This is the right time, for me, to leave politics and return to the justice system...."|
|Governor Dennis M. Daugaard||Republican||Governor||Open Chair. Term Limit|
|Congressman Kristi Lynn Noem||Republican||House At-Large||Open Seat. 14 November 2016: Candidate for Governor in 2018.|
|Senator Robert P. "Bob" Corker, Jr.||Republican||Senate Class 1||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 ...."|
|Governor William "Bill" Haslam||Republican||Governor||Open Chair. Term Limit|
|Congressman John J. Duncan, Jr.||Republican||House CD 2||Open Seat. 31 July 2017: Announced that he would not seek re-election.|
|Congressman Diane Lynn Black||Republican||House CD 6||Open Seat. 2 August 2017: Ran for but lost her party's nomination for Governor in 2018.|
|Congressman Marsha Blackburn||Republican||House CD 7||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.
|Congressman Lloyd "Ted" Poe||Republican||House CD 2||Open Seat. 7 November 2017: "I will continue this work every day until I retire at the end of this term...."|
|Congressman Samuel Robert "Sam" Johnson||Republican||House CD 3||Open Seat. 6 January 2017: Announced he won't seek re-election.|
|Congressman Jeb Hensarling||Republican||House CD 5||Open Seat. 31 October 2017: "Today I am announcing that I will not seek reelection to the U.S. Congress in 2018."|
|Congressman Joe Linus Barton||Republican||House CD 6||Open Seat. 30 November 2017: "I am announcing today that I will not seek reelection in 2018...."|
|Congressman Robert "Beto" O'Rourke||Democratic||House CD 16||Open Seat. 31 March 2017: Announced that he is running for the U.S. Senate Class I seat in 2018.|
|Congressman Lamar Seeligson Smith||Republican||House CD 21||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...."|
|Congressman Raymond Eugene "Gene" Green||Democratic||House CD 29||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."|
|Senator Orrin G. Hatch||Republican||Senate Class 1||Open Seat. 02 January 2018: "I've decided to retire at the end of this term...."|
|Governor Gary R. Herbert||Republican||Governor||Open Chair|
|Congressman Thomas Alexander "Tom" Garrett, Jr.||Republican||House CD 5||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.
|Congressman Robert William "Bob" Goodlatte||Republican||House CD 6||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.
|Congressman Dave Reichert||Republican||House CD 8||Open Seat. 6 September 2017: Not a candidate for re-election.|
|Congressman Evan H. Jenkins||Republican||House CD 3||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.
|Congressman Paul D. Ryan||Republican||House CD 1||Open Seat. 3 January 2017: Elected Speaker of the House.|
11 April 2018: Not running for re-election.
|Governor Matt Mead||Republican||Governor||Open Chair. 7 February 2017: Will not run for re-election in 2018.|
|Office||Reason for Open Chair or Seat|
|Voluntary||Term Limit||Vacant||Lost Primary||Total|
Parties appear in parenthesis and italics when a candidate receives the endorsement of a given Party and/or official sources indicate a candidate's association with a particular Party but only where the Party in question does not appear on the actual ballot as such.
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