S.D. Codified Laws § 25-7A-56.7
Upon entry of an order for support, each party to any paternity or child support proceeding shall file with the appropriate tribunals as defined in § 25-9C-102 a written statement specifying the party's name, social security number, residential and mailing address, telephone number, driver's license number, and the name, address, and telephone number of any current employers. A tribunal may not accept for filing any order for support unless and until the written statement is provided by each party. The tribunal shall forward the written statement to the state case registry. If the required information is unavailable, the order for support may be filed with the tribunal providing the trial judge certifies in writing on the order that the required information is unavailable. Each party subject to an order for support shall also notify the appropriate tribunals of any changes to this information, as necessary.
In any subsequent child support enforcement or modification action between the parties, and upon sufficient showing that diligent efforts have been made to ascertain the location of a party, the tribunal shall deem due process requirements for notice and service of process satisfied by delivering written notice to the most recent residential or employer address on file with the tribunal.
SDCL 25-7A-56.7