Iowa Code Title VIII. Transportation [Chs. 306-330B] § 321.38. Plates--method of attaching--imitations prohibited

Every registration plate shall at all times be securely fastened in a horizontal position to the vehicle for which it is issued so as to prevent the plate from swinging and at a height of not less than twelve inches from the ground, measuring from the bottom of the plate, in a place and position to be clearly visible and shall be maintained free from foreign materials and in a condition to be clearly legible. An imitation plate or plates imitating or purporting to imitate the official registration plate of any other state or territory of the United States or of any foreign government shall not be fastened to the vehicle.