S.D. Codified Laws § 54-9-8

The assignment must be recorded and the inventory filed with the register of deeds of the county in which the assignor resided at the date of the assignment or of the county to which such county is attached for judicial purposes; or, if he did not then reside in this state, with the like officer of the county in which his principal place of business was then situated; or, if he had not then a residence or place of business in this state, with the like officer of the county in which the principal part of the assigned property was then situated. If the assignment is executed by more than one assignor, it must be recorded and a copy of the inventory must be filed with the register of deeds of every county in which any of the assignors resided at its date, or in which any of them, not then residing in this state, had then a place of business.