S.D. Codified Laws § 9-11-9
Current with legislation signed by the governor on or before 3/6/2024
If an election changes the form of government or number of commissioners, wards, or trustees is approved, at the next annual municipal election or at a special election called by the governing board and held pursuant to § 9-13-14, officers shall be chosen under the changed form of government.
SDCL 9-11-9