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Your two U.S. senators in South Dakota are both Republicans:


South Dakota's current U.S. senators are Republicans John Thune (since 2005) and Mike Rounds (since 2015).


- **John Thune (R)** — the senior senator. 
His term expires in 2029.

- **Mike Rounds (R)** — the junior senator. 
His term expires in 2027,
 and 
he is seeking a third term in the 2026 election, being challenged by Democratic former state trooper Julian Beaudion and independent military officer Brian Bengs.


For contact information or to reach their offices, you can visit their official websites at thune.senate.gov and rounds.senate.gov.