SDCL § 9-2-7: Determination of number of inhabitants in wards.

For the purpose of dividing a municipality into wards, the number of inhabitants is determined by population, as defined in § 2-14-2. The governing body may, by resolution, authorize the finance officer to determine the number of inhabitants by filing a certificate showing the number of individuals registered to vote in each ward of the municipality. That number multiplied by two constitutes the number of inhabitants until the next federal census is completed.