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South Dakota U.S. senators
South Dakota is represented in the U.S. Senate by Mike Rounds (R) and John Thune (R). In the 2026 election, Mike Rounds won re-election.
| Senator | Party | Seat | Term ends | Next election |
|---|---|---|---|---|
| Mike Rounds | Republican | Class II | Jan 3, 2027 | 2026 |
| John Thune | Republican | Class III | Jan 3, 2029 | 2028 |
South Dakota 2026 Senate election
Mike Rounds won (Mike Rounds 60.5% · Brian Bengs 39.5%). Mike Rounds keeps the seat.
PoliGov's final forecast gave Brian Bengs a <1% chance and Mike Rounds a >99% chance. Full South Dakota forecast →
In the 2024 presidential election, South Dakota voted Republican by 29.2 points. 2024 results by state →