1974Final resultsIncumbent defeated
1974 election for South Dakota Legislative District 11
South Dakota State Senate · South Dakota
Michael Oconnor (D) won with 12.7% of the vote, defeating David Billion (D) by 2.0 points.
Michael OconnorDemocrat · winner · incumbent
12.7%24,108
David BillionDemocrat
10.7%20,236
Marilynn KelmDemocrat
10.6%20,097
Jerry MayerDemocrat · incumbent
10.2%19,347
Sheldon R. SongstadRepublican
10.2%19,290
Oscar AustadRepublican · incumbent
9.9%18,847
Wally G. MyersDemocrat
9.4%17,922
Peter P. HeggRepublican
9.0%17,118
Marie MillsRepublican
8.7%16,527
George KirkRepublican
8.6%16,340
189,832 votes
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET
The seat over time
D − R margin in this seat's races around 1974
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET