McSally (R-Arizona)
Jones (D-Alabama)
Sullivan (R-Alaska)
Cotton (R-Arkansas)
Gardner (R-Colorado)
Coons (D-Delaware)
Perdue (R-Georgia)
Reich (R-Idaho)
Durbin (D-Illinois)
Ernst (R-Iowa)
1/
McConnell (R-Kentucky)
Cassidy (R-Louisiana)
Collins (R-Maine)
Markey (D-Massachusetts)
Peters (D-Michigan)
Smith (D-Minnesota)
Hyde-Smith (R-Mississippi)
Danes (R-Montana)
Sasse (R-Nebraska)
Shaheen (D-New Hampshire)
Booker (D-New Jersey)
2/
Tillis (R-North Carolina)
Inhofe (R-Oklahoma)
Merkley (D-Oregon)
Reed (D-Rhode Island)
Graham (R-South Carolina)
Rounds (R-South Dakota)
Open (R-Tennessee)
Cornyn (R-Texas)
Warner (D-Virginia)
Capito (R-West Virginia)
Enzi (R-Wyoming)
22 Republican Senate seats will be up for re-election. 2 of those seats will be open due to the retirements.
12 Democratic Senate seats will be up for re-election.
Four of the members up for re-election will be age 75 or older.