Iowa Code § 321F.8

All motor vehicles which are primarily garaged or located in this state and which are the subject of a lease shall be registered in this state. This section shall not be construed to exempt any motor vehicle from registration which is otherwise subject to registration under the provisions of chapter 321, provided, however, that the provisions of this section shall not apply to motor vehicles in fleets whose registrations are apportioned under the provisions of chapter 326.