Is a back license plate required in Missouri?

Yes, both a front and a back license plate is required by law. Unless: Ryhed wrote: LICENSE (REGISTRATION) PLATES - Missouri law requires that license plates be securely fastened to a vehicle, and that all parts of the plates are visible and clean for view or inspection by any law enforcement entity. If you have frames around your license plates, the Missouri State Highway Patrol reminds you that the frames must not cover any part of the plates. If you receive two plates, you must place one on the front and one on the back of your vehicle. If you have a trailer or a motorcycle, you will only receive one plate, which must be on the back of your vehicle. If you have a truck licensed in excess of 12,000 pounds, you will only receive one plate, which must be placed on the front of the truck. If you want a second plate, it must be specifically requested. You must place the original plate on the front of your truck and if a second plate is issued, it must be placed on the rear of the truck.