Review Time.
Not seeking re-election.
[Senate]
Bob Corker - Republican - not seeking re-election September 27, 2017
Jeff Flake - Republican – not seeking reelection October 24, 2017
Orrin Hatch - Republican - not seeking re-election January 2, 2018
No Name - Republican [Departure Soon]
[House]
Bill Shuster - Republican - not seeking re-election January 2, 2018
Bob Goodlatte - Republican - not seeking re-election November 9, 2017
Carol Shea-Porter - Democrat - not seeking re-election October 6, 2017
Charles W. Dent - Republican - not seeking re-election September 7, 2017
Darrell Issa - Republican - not seeking re-election January 10, 2017
Dave Reichert - Republican - not seeking re-election September 6, 2017
David Trott - Republican - not seeking re-election September 11, 2017
Dennis Ross - Republican - not seeking re-election April 11, 2018
Edward Royce - Republican - not seeking re-election January 8, 2018
Elizabeth Esty – Democrat - not seeking re-election April 2, 2018
Frank LoBiondo - Republican - not seeking re-election November 7, 2017
Gene Green - Democrat - not seeking re-election November 13, 2017
Gregg Harper - Republican - not seeking re-election January 4, 2018
Ileana Ros-Lehtinen - Republican - not seeking re-election April 30, 2017
Jeb Hensarling - Republican - not seeking re-election October 31, 2017
Jim Bridenstine – Republican - not seeking re-election November 9, 2016
Joe Barton - Republican - not seeking re-election November 30, 2017
John Delaney – Democrat - not seeking re-election July 28, 2017
John J. Duncan, Jr. - Republican - not seeking re-election July 31, 2017
Lamar Smith - Republican - not seeking re-election November 2, 2017
Luis V. Gutierrez - Democrat - not seeking re-election November 28, 2017
Lynn Jenkins – Republican - not seeking re-election January 25, 2017
Niki Tsongas – Democrat - not seeking re-election August 9, 2017
Paul Ryan - Republican - not seeking re-election April 11, 2018
Rick Nolan - Democrat - not seeking re-election February 9, 2018
Robert Brady – Democrat - not seeking re-election January 31, 2017
Rodney Frelinghuysen - Republican - not seeking re-election January 9, 2018
Ruben J. Kihuen - Democrat - not seeking re-election December 16, 2017
Ryan Costello - Republican - not seeking re-election March 26,2018
Sam Johnson - Republican - not seeking re-election January 6, 2017
Sandy Levin - Democrat - not seeking re-election December 2, 2017
Ted Poe - Republican - not seeking re-election November 7, 2017
Thomas Rooney – Republican - not seeking re-election February 19, 2018
Trey Gowdy - Republican - not seeking re-election January 31, 2018
[Resigned]
Al Franken - Democratic U.S. Senate - Resigns January 2, 2018
Blake Farenthold - Republican U.S. House - Resigns April 6, 2017
Jason Chaffetz - Republican U.S. House - Resigns June 30, 2017
John Conyers, Jr. - Democrat U.S. House - Resigns December 5, 2017
Louise Slaughter - Democrat U.S. House - Resigns DIED March 16, 2018
Patrick Meehan - Republican U.S. House - Resigns April 27, 2018
Patrick J. Tiberi - Republican U.S. House - Resigns January 5, 2017
Thad Cochran - Republican U.S. Senate - Resigns April 1, 2018
Tim Murphy - Republican U.S. House - Resigns October 5, 2017
Trent Franks - Republican U.S. House - Resigns December 7, 2017
Xavier Becerra - Democrat Attorney General of California - Resigns January 24, 2017
https://www.nytimes.com/interactive/2018/01/09/upshot/congress-retirements-tracker.html