I recommend the Polish license plates (with a map)
The application includes:
- a map of Poland with all Polish counties together with the license plate assigned
- a list of all counties with information about the province, the capital of the poviat

Clicking on the item is transferred to the map.

Some best features:
- interactive map
- full list of counties
- sorting according to the number, county, voivodship and the capital of the county
- search by number, county, voivodship and poviat capital
- Active application development (write to me if you have questions, suggestions, comments)

The application does not represent a government entity.

The data it contains is publicly available information available to everyone.

Be happy!