All newly-elected/re-elected Senators who will serve in the 115th Congress appear under 'Class 3'. Senators appearing in the 'Class 3' column were elected in 2016 to the full six-year term beginning at Noon, 3 January 2017.
Reference: United States Senate Electoral "Classes"
| Class 1 [next regular election: Tuesday 6 November 2018] | Class 2 [next regular election: Tuesday 3 November 2020] | Class 3 [next regular election: Tuesday 8 November 2022] |
|---|---|---|
| Arizona: Flake (R) | Alabama: Jones (D) | Alabama: Shelby (R) |
| California: Feinstein (D) | Alaska: Sullivan (R) | Alaska: Murkowski (R) |
| Connecticut: Murphy (D) | Arkansas: Cotton (R) | Arizona: McSally (R) |
| Delaware: Carper (D) | Colorado: Gardner (R) | Arkansas: Boozman (R) |
| Florida: Nelson (D) | Delaware: Coons (D) | California: Harris (D) |
| Hawaii: Hirono (D) | Georgia: Perdue (R) | Colorado: Bennet (D) |
| Indiana: Donnelly (D) | Idaho: Risch (R) | Connecticut: Blumenthal (D) |
| Maine: King (I) | Illinois: Durbin (D) | Florida: Rubio (R) |
| Maryland: Cardin (D) | Iowa: Ernst (R) | Georgia: Isakson (R) |
| Massachusetts: Warren (D) | Kansas: Roberts (R) | Hawaii: Schatz (D) |
| Michigan: Stabenow (D) | Kentucky: McConnell (R) | Idaho: Crapo (R) |
| Minnesota: Klobuchar (D) | Louisiana: Cassidy (R) | Illinois: Duckworth (D) |
| Mississippi: Wicker (R) | Maine: Collins (R) | Indiana: Young (R) |
| Missouri: McCaskill (D) | Massachusetts: Markey (D) | Iowa: Grassley (R) |
| Montana: Tester (D) | Michigan: Peters (D) | Kansas: Moran (R) |
| Nebraska: Fischer (R) | Minnesota: Smith (D) | Kentucky: Paul (R) |
| Nevada: Heller (R) | Mississippi: Hyde-Smith (R) | Louisiana: Kennedy (R) |
| New Jersey: Menendez (D) | Montana: Daines (R) | Maryland: Van Hollen (D) |
| New Mexico: Heinrich (D) | Nebraska: Sasse (R) | Missouri: Blunt (R) |
| New York: Gillibrand (D) | New Hampshire: Shaheen (D) | Nevada: Cortez Masto (D) |
| North Dakota: Heitkamp (D) | New Jersey: Booker (D) | New Hampshire: Hassan (D) |
| Ohio: Brown (D) | New Mexico: Udall (D) | New York: Schumer (D) |
| Pennsylvania: Casey (D) | North Carolina: Tillis (R) | North Carolina: Burr (R) |
| Rhode Island: Whitehouse (D) | Oklahoma: Inhofe (R) | North Dakota: Hoeven (R) |
| Tennessee: Corker (R) | Oregon: Merkley (D) | Ohio: Portman (R) |
| Texas: Cruz (R) | Rhode Island: Reed (D) | Oklahoma: Lankford (R) |
| Utah: Hatch (R) | South Carolina: Graham (R) | Oregon: Wyden (D) |
| Vermont: Sanders (I) | South Dakota: Rounds (R) | Pennsylvania: Toomey (R) |
| Virginia: Kaine (D) | Tennessee: Alexander (R) | South Carolina: Scott (R) |
| Washington: Cantwell (D) | Texas: Cornyn (R) | South Dakota: Thune (R) |
| West Virginia: Manchin (D) | Virginia: Warner (D) | Utah: Lee (R) |
| Wisconsin: Baldwin (D) | West Virginia: Capito (R) | Vermont: Leahy (D) |
| Wyoming: Barrasso (R) | Wyoming: Enzi (R) | Washington: Murray (D) |
| Wisconsin: Johnson (R) | ||
| Class 1 - 33 Seats 23 Democratic (D) 8 Republican (R) 2 Independent (I) | Class 2 - 33 Seats 21 Republican (R) 12 Democratic (D) | Class 3 - 34 Seats 22 Republican (R) 12 Democratic (D) |
| Entire Senate - 100 Seats 51 Republican (R) 47 Democratic (D) 2 Independent (I) | ||
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Modified .