2018Final results
2018 election for South Dakota Legislative District 20
South Dakota State Senate · South Dakota
Joshua Klumb (R) won with 72.5% of the vote, defeating Dan Miller (D) by 45.0 points.
Joshua KlumbRepublican · winner · incumbent
72.5%6,606
Dan MillerDemocrat
27.5%2,507
9,113 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
The seat over time
D − R margin in this seat's races around 2018
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET