SDCL § 38-8-42: Terms of office of district supervisors.

For the purpose of staggering terms, at the first general election, the three at-large candidates receiving the largest number of votes shall be elected for a four-year term, and the two candidates receiving the next highest number of votes shall be elected for two-year terms. In succeeding elections all supervisors shall be elected for four-year terms commencing the following January first.