Mo. Rev. Stat. § 355.161: Registered office and agent.

Each corporation must continuously maintain in this state:

(1) A registered office with the same address as that of the registered agent; and

(2) A registered agent, who may be:

(a) An individual who resides in this state and whose office is identical with the registered office;

(b) A domestic business or nonprofit corporation whose office is identical with the registered office; or

(c) A foreign business or nonprofit corporation authorized to transact business in this state whose office is identical with the registered office.