N.D. Cent. Code § 39-04-11
Unless otherwise provided by law, an individual may not operate a vehicle on a public highway of this state unless the vehicle has a distinctive number assigned to the vehicle by the department, and two number plates, bearing the distinctive number conspicuously displayed, horizontally and in an upright position, one on the front and one on the rear of the vehicle, each securely fastened, except number plates assigned to a housetrailer must be attached to the rear of the housetrailer. Number plates assigned to a motorcycle or trailer must be attached to the rear of the motorcycle or trailer and may be displayed vertically. When only one number plate is furnished for an apportioned vehicle registered under the international registration plan as authorized in section 39-19-04, truck tractor, or semitrailer, the plate must be attached to the front of the apportioned vehicle or truck tractor and the rear of the semitrailer. The bottom of each number plate must be at a height of not less than twelve inches [30.48 centimeters] above the level surface upon which the vehicle stands. Each plate must be mounted in a visible manner that clearly displays the distinctive number assigned to the vehicle and the name of the state on the plate. As far as is reasonably possible, the plates must at all times be kept free and clear of mud, ice, or snow so as to be clearly visible and all number plates, markers, or evidence of registration or licensing except for the current year must be removed from the vehicle. All vehicle license plates issued by the department are the property of the department for the period for which the plates are valid. An annual registration tab or sticker for the current registration year must be displayed on each number plate, in the area designated by the department for the tab or sticker, in those years for which tabs or stickers are issued in lieu of number plates.
N.D.C.C. § 39-04-11