U.S. Senate elections in South Dakota

South Dakota's U.S. Senate seats are held by Republican John R. Thune and Republican Mike Rounds; Thune won the most recent race by 43.5 points in 2022. Thune has held one seat since 2004 and Rounds the other since 2014. The 2022 race put Thune ahead of Brian L Bengs, 43.5 points clear. Across 37 elections since 1914, Republicans have won 24 and Democrats 12, with 1 going to other parties. Of those, the closest was 2002, decided by 0.15 points; the widest 1984, by 49.0 points.