2026 South Dakota House of Representatives election – District 18Nov 3, 2026IncumbentJulie Auch RepublicanGeneral electionNovember 3, 2026Mike Stevens Republican IncumbentDemocrat Nominee TBDPrimaries2026 South Dakota House of Representatives district 18 Republican primaryResults 5,461 votes✓Mike Stevens Incumbent41.3% 2,256John R. Marquardt31.5% 1,719Michael Nutley27.2% 1,486
