Iowa Code § 499.72: Registered office and registered agent.

Each association must continuously maintain in this state both of the following:

1. A registered office that may be the same as any of its places of business.

2. A registered agent, who may be any of the following:

a. An individual who resides in this state and whose business office is identical with the registered office.

b. A domestic corporation or not-for-profit domestic corporation whose business office is identical with the registered office.

c. A foreign corporation or not-for-profit foreign corporation authorized to transact business in this state whose business office is identical with the registered office.