Current U.S. Senators for the state of South Dakota:
South Dakota was admitted to the Union on November 2, 1889 and elects U.S. senators to Class 2 and Class 3. Its current U.S. senators are Republicans John Thune (since 2005) and Mike Rounds (since 2015).
Source: Wikipedia
https://en.wikipedia.org/wiki/ListofUnitedStatessenatorsfromSouth_Dakota