2018Final results
2018 election for South Dakota Legislative District 26
South Dakota State Senate · South Dakota
Troy Heinert (D) won with 53.0% of the vote, defeating Joel Koskan (R) by 6.1 points.
Troy HeinertDemocrat · winner · incumbent
53.0%3,896
Joel KoskanRepublican
47.0%3,450
7,346 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