The U.S. Congress comprises 535 members: 435 in the House of Representatives and 100 in the Senate. Since representatives serve two-year terms, they are all up for reelection every even-numbered year, but senators serve six-year terms, and their terms are staggered such that only one-third of Senate seats are up for reelection in any given election year.
As a handy reference, the following list breaks down, by party and year, when every sitting U.S. senator will next be up for reelection. Thirty-four Senate seats will be contested in the next election on Nov. 8, 2022:
Democrats Up for Reelection in 2022
Arizona: Mark Kelly*
California: Alex Padilla
Colorado: Michael Bennet
Connecticut: Richard Blumenthal
Georgia: Raphael Warnock*
Hawaii: Brian Schatz
Illinois: Tammy Duckworth
Maryland: Chris Van Hollen
Nevada: Catherine Cortez Masto
New Hampshire: Maggie Hassan
New York: Chuck Schumer
Oregon: Ron Wyden
Vermont: Patrick Leahy
Washington: Patty Murray
Republicans Up for Reelection in 2022
Alabama: Richard Shelby+ (Retiring)
Alaska: Lisa Murkowski
Arkansas: John Boozman
Florida: Marco Rubio
Idaho: Mike Crapo
Indiana: Todd Young
Iowa: Chuck Grassley
Kansas: Jerry Moran
Kentucky: Rand Paul
Louisiana: John N. Kennedy
Missouri: Roy Blunt
North Carolina: Richard Burr+ (Retiring)
North Dakota: John Hoeven
Ohio: Rob Portman+ (Retiring)
Oklahoma: James Lankford
Pennsylvania: Pat Toomey+ (Retiring)
South Carolina: Tim Scott
South Dakota: John Thune
Utah: Mike Lee
Wisconsin: Ron Johnson+ (Retiring)
Democrats Up for Reelection in 2024
Arizona: Kyrsten Sinema
California: Dianne Feinstein
Connecticut: Chris Murphy
Delaware: Tom Carper
Hawaii: Mazie Hirono
Maryland: Ben Cardin
Massachusetts: Elizabeth Warren
Michigan: Debbie Stabenow
Minnesota: Amy Klobuchar
Montana: Jon Tester
Nevada: Jacky Rosen
New Jersey: Bob Menendez
New Mexico: Martin Heinrich
New York: Kirsten Gillibrand
Ohio: Sherrod Brown
Pennsylvania: Bob Casey Jr.
Rhode Island: Sheldon Whitehouse
Virginia: Tim Kaine
Washington: Maria Cantwell
West Virginia: Joe Manchin
Wisconsin: Tammy Baldwin
Independents Up for Reelection in 2024
Maine: Angus King
Vermont: Bernie Sanders
Republicans Up for Reelection in 2024
Florida: Rick Scott
Indiana: Mike Braun
Mississippi: Roger Wicker
Missouri: Josh Hawley
Nebraska: Deb Fischer
North Dakota: Kevin Cramer
Tennessee: Marsha Blackburn
Texas: Ted Cruz
Utah: Mitt Romney
Wyoming: John Barrasso
Democrats Up for Reelection in 2026
Colorado: John Hickenlooper
Delaware: Chris Coons
Georgia: Jon Ossoff
Illinois: Dick Durbin
Massachusetts: Ed Markey
Michigan: Gary Peters
Minnesota: Tina Smith
New Hampshire: Jeanne Shaheen
New Jersey: Cory Booker
New Mexico: Ben Ray Lujan
Oregon: Jeff Merkley
Rhode Island: Jack Reed
Virginia: Mark Warner
Republicans Up for Reelection in 2026
Alabama: Tommy Tuberville
Alaska: Dan Sullivan
Arkansas: Tom Cotton
Colorado: Cory Gardner
Idaho: James Risch
Iowa: Joni Ernst
Kansas: Roger Marshall
Kentucky: Mitch McConnell
Louisiana: Bill Cassidy
Maine: Susan Collins
Mississippi: Cindy Hyde-Smith
Montana: Steve Daines
Nebraska: Ben Sasse
North Carolina: Thom Tillis
Oklahoma: Jim Inhofe
South Carolina: Lindsey Graham
South Dakota: Mike Rounds
Tennessee: Bill Hagerty
Texas: John Cornyn
West Virginia: Shelley Moore Capito
Wyoming: Cynthia Lummis
* Although Sens. Warnock and Kelly (both Democrats) did not assume office until 2021, they are both filling out the terms of senators who retired or died while in office, so they will therefore be up for reelection in 2022.
+ Sens. Shelby, Burr, Portman, Toomey, and Johnson (all Republicans) have announced their intentions to retire at the end of their current terms and not seek reelection, but the seats they currently hold will be contested in the 2022 election.