S.D. Codified Laws § 9-4-4.4
The governing body shall hold a public hearing to consider extension of its boundaries within sixty days of the adoption of the resolution of intent provided for in §§ 9-4-4.2 and 9-4-4.11. Prior to adoption of the resolution of annexation, a copy of the adopted resolution of intent and a notice of the time and place of the public hearing on the resolution of annexation shall be forwarded by certified mail to the affected landowners and the county auditor, who shall then forward the adopted resolution of intent and notice of public hearing regarding the resolution of annexation to the county commissioners. The notice shall be postmarked not less than ten days and not more than twenty days before the date of the public hearing. The governing body shall utilize and rely upon the records of the county director of equalization for the purposes of determining the affected landowners. The governing body may adopt an annexation resolution, containing the description and boundaries of the territory to be annexed, pursuant to chapter 9-19, within one hundred and twenty days of the public hearing. The governing body shall consider any objections to the resolution of annexation and the adopted resolution of intent, and may adopt the resolution of annexation with or without amendments, and may also add to the resolution of annexation any amendments to the resolution of intent. No amendment may be made affecting any property not described in the original resolution.
SDCL 9-4-4.4