Idaho Rules of Civil Procedure Rule 4(d)(4). Service Upon Domestic or Foreign Corporations.
(A) Upon a domestic or foreign corporation by delivering a copy of the summons and complaint to an officer, managing or general agent, or to any other agent authorized by appointment or by statute of this state to receive service of process, and upon a partnership or other unincorporated association which is subject to suit under a common name, by delivering a copy of the summons and the complaint to an officer or the managing or general agent of the partnership or association, or to any other agent authorized by appointment or by statute of this state to receive service of process. If service is upon a statutory agent, any statutory requirement as to the number of copies of summons and complaint to be served shall be followed, and if such agent is a state official such service may be made by registered or certified mail, and also, if the statute so requires, by mailing a copy to the defendant.
(B) Whenever any foreign corporation which has qualified in the state by filing with the Secretary of State or a domestic corporation or association shall not have designated a person actually residing in the state upon whom service of process can be made, or whenever such agent of a corporation shall resign, be removed from office, or shall have died or shall have moved from the state, or if after due diligence neither the designated agent of the corporation nor any officer or managing agent of the corporation can be found within the state, then service of any summons and complaint against the corporation may be made by the party serving the same by mailing copies of the summons and complaint by registered or certified mail to the corporation addressed to its registered place of business and to the president or secretary of the corporation at the addresses shown on the most current annual statement filed with the Secretary of State. Service shall be complete upon such mailing by certified or registered mail. The party or attorney serving the corporation under this paragraph shall make a return certificate indicating compliance with the provision of this rule and attaching a receipt of the mailing.
(Amended effective July 1, 1977; amended April 11, 1979, effective May 1, 1979.)