1984Final results
1984 election for President in South Dakota
President · South Dakota
Ronald Reagan (R) won with 63.0% of the vote, defeating Walter Mondale (D) by 26.5 points.
Ronald ReaganRepublican · winner
63.0%200,267
Walter MondaleDemocrat
36.5%116,113
Dennis SerretteOther party
0.4%1,150
Melvin MasonSocialist Workers
0.1%337
317,867 votes
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET
The seat over time
D − R margin in this seat's races around 1984
Races before and after
Source: MIT Election Data and Science LabUpdated Sep 30, 2026, 7:25 AM ET
The candidates
Ronald Reagan (R)Walter Mondale (D)
Also on the ballot: Dennis Serrette (Other party), 0.4%; Melvin Mason (Socialist Workers), 0.1%