Polish vehicle registration plates indicate the region of registration of the vehicle encoded in the number plate.
According to Polish law, the registration plate is tied to the vehicle, not the owner. There is no possibility for the owner to keep the licence number for use on a different car, even if it's a custom number. The licence plates are issued by the powiat (county) of the vehicle owner's registered address of residence, in the case of a natural person. If it is owned by a legal person, the place of registration is determined by the address of its seat. Vehicles leased under operating leases and many de facto finance leases will be registered at the seat of the lessor. When a vehicle changes hands, the new owner must apply for new vehicle registration document bearing his or her name and registered address. The new owner may obtain a new licence plate although it is not necessary when new owner's residence address lies in the same area as the previous owner's. In such a situation the licence plates are usually carried over to the new owner, because the change carries an additional cost. Upon purchasing a vehicle from another person, if the vehicle has an EU plate, the new owner must replace it with a license for their address and area, and give the EU plate to their powiat plate mint to free up numbers in the future. If the car has a pre- May 1, 2006 plate, the owner is free to do whatever they wish with it, as long as it's legal with the Polish law. The plaque cannot be replaced if destroyed. The change of the whole set is required.
The change in system shown below in 2001 is related to the reduction in the previous year of the number of voivodeships in Poland from 49 to 16, based on the country's historic regions. The pre-2001 licence plates (white letters on black background) can be used indefinitely, but since they are obsolete they have to be replaced in case of change of vehicle's ownership.