S.D. Codified Laws § 11-6-12
Following adoption of a comprehensive plan by the governing bodies, the city and county planning commissions may prepare zoning regulations for all property in the joint jurisdictional area consistent with the comprehensive plan. The regulations shall delineate the authority of the governing bodies over all zoning matters pertaining to the joint jurisdictional area. Such regulations may include relinquishment by the county of some or all of its zoning authority within the joint jurisdictional area. In those instances where a county has granted to a municipality sole zoning authority beyond said municipality's existing corporate limits, the notice and public hearing requirements of chapter 11-4 shall apply.
The county and city planning commissions shall meet jointly and hold at least one public hearing on the zoning regulations. Notice of the time and place of the hearing shall be given once by either the city or county at least ten days in advance by publication in a legal newspaper. Following the public hearing, each planning commission shall submit a recommendation to each respective governing body.
SDCL 11-6-12