This was the first state senate election held after the state's county-based apportionment plan was struck down by the courts in Gorin v. Karpan in favor of a single-member district plan.

To ease sorting, races won by a Republican candidate have a positive margin, while races won by Democratic candidates have negative margins.

[2] SD 23's results were voided for Precinct 1-8 due to voters receiving incorrect ballots, and a new election was called for November 24.

For the sake of brevity, races in which no candidates filed will not be shown.

[8][9] Barbara Reese withdrew from the race after the Democratic primary.