SDCL § 10-33-10: Operating property assessed for taxation by department.

All property, real and personal, which is actually and necessarily used in providing telephone and exchange service comprising rental and toll service by means of wired circuits and otherwise in this state, and which belongs to any telephone company in this state which is not subject to the tax imposed by § 10-33-21 shall be assessed for the purpose of taxation by the Department of Revenue, and not otherwise.