S.D. Codified Laws § 12-2-5
Any other provision of law notwithstanding, the members of the governing body of any governmental subdivision may choose to hold their elections in conjunction with the regular June primary election. The combined election is subject to approval by the county commissions of the counties in which the governmental subdivision is located. Expenses of a combined election shall be shared in a manner agreed upon by the governing body of the subdivision and the county commissions involved. All other governmental responsibilities associated with holding elections under the provisions for that subdivision and Title 12 shall be shared as agreed upon by the governing bodies. The governmental subdivision clerk shall publish the notice of vacancy between February fifteenth and March first. No nominating petition may be circulated for signatures until March first. Nominating petitions shall be filed under the provisions required for that subdivision by the last Tuesday in March. The clerk shall certify to the appropriate county auditor the candidate names and ballot language to be voted on by the first Thursday after the last Tuesday in March.
SDCL 12-2-5