| State(linked tosummaries below) | Incumbent | Results | Candidates |
| Senator | | Electoral history | Last race |
| Alabama | Katie Britt | Republican | 2022 | 66.6% R | Incumbent's intent unknown | mw- TBD |
| Alaska | Lisa Murkowski | Republican | 2002 (appointed)2004201020162022 | 53.7% R | Incumbent's intent unknown | TBD |
| Arizona | Mark Kelly | Democratic | 2020 (special)2022 | 51.4% D | Incumbent's intent unknown | TBD |
| Arkansas | John Boozman | Republican | 201020162022 | 65.7% R | Incumbent's intent unknown | TBD |
| California | Alex Padilla | Democratic | 2021 (appointed)2022 (special)2022 | 61.1% D | Incumbent's intent unknown | TBD |
| Colorado | Michael Bennet | Democratic | 2009 (appointed)201020162022 | 55.9% D | Incumbent's intent unknown | TBD |
| Connecticut | Richard Blumenthal | Democratic | 201020162022 | 57.5% D | Incumbent's intent unknown | TBD |
| Florida | TBD | TBD | 2026 (special) | TBD | Incumbent to be determined in 2026 | TBD |
| Georgia | Raphael Warnock | Democratic | 2021 (special)2022 | 51.4% D | Incumbent's intent unknown | TBD |
| Hawaii | Brian Schatz | Democratic | 2012 (appointed)2014 (special)20162022 | 71.2% D | Incumbent's intent unknown | TBD |
| Idaho | Mike Crapo | Republican | 19982004201020162022 | 60.7% R | Incumbent's intent unknown | TBD |
| Illinois | Tammy Duckworth | Democratic | 20162022 | 56.8% D | Incumbent's intent unknown | TBD |
| Indiana | Todd Young | Republican | 20162022 | 58.6% R | Incumbent's intent unknown | TBD |
| Iowa | Chuck Grassley | Republican | 19801986199219982004201020162022 | 56.0% R | Incumbent's intent unknown | TBD |
| Kansas | Jerry Moran | Republican | 201020162022 | 60.0% R | Incumbent's intent unknown | TBD |
| Kentucky | Rand Paul | Republican | 201020162022 | 61.8% R | Incumbent's intent unknown | TBD |
| Louisiana | John Kennedy | Republican | 20162022 | 61.6% R | Incumbent's intent unknown | TBD |
| Maryland | Chris Van Hollen | Democratic | 20162022 | 65.8% D | Incumbent's intent unknown | TBD |
| Missouri | Eric Schmitt | Republican | 2022 | 55.4% R | Incumbent's intent unknown | TBD |
| Nevada | Catherine Cortez Masto | Democratic | 20162022 | 48.8% D | Incumbent's intent unknown | TBD |
| New Hampshire | Maggie Hassan | Democratic | 20162022 | 53.5% D | Incumbent's intent unknown | TBD |
| New York | Chuck Schumer | Democratic | 19982004201020162022 | 56.8% D | Incumbent's intent unknown | TBD |
| North Carolina | Ted Budd | Republican | 2022 | 50.5% R | Incumbent's intent unknown | TBD |
| North Dakota | John Hoeven | Republican | 201020162022 | 56.4% R | Incumbent's intent unknown | TBD |
| Ohio | TBD | TBD | 2026 (special) | TBD | Incumbent to be determined in 2026 | TBD |
| Oklahoma | James Lankford | Republican | 2014 (special)20162022 | 64.3% R | Incumbent's intent unknown | TBD |
| Oregon | Ron Wyden | Democratic | 1996 (special)19982004201020162022 | 55.8% D | Incumbent running | ▌Ron Wyden (Democratic) |
| Pennsylvania | John Fetterman | Democratic | 2022 | 51.2% D | Incumbent's intent unknown | TBD |
| South Carolina | Tim Scott | Republican | 2013 (appointed)2014 (special)20162022 | 62.9% R | Incumbent retiring | TBD |
| South Dakota | John Thune | Republican | 2004201020162022 | 69.6% R | Incumbent's intent unknown | TBD |
| Utah | Mike Lee | Republican | 201020162022 | 53.2% R | Incumbent's intent unknown | TBD |
| Vermont | Peter Welch | Democratic | 2022 | 68.5% D | Incumbent's intent unknown | TBD |
| Washington | Patty Murray | Democratic | 199219982004201020162022 | 57.1% D | Incumbent's intent unknown | TBD |
| Wisconsin | Ron Johnson | Republican | 201020162022 | 50.4% R | Incumbent's intent unknown | TBD |