SU on a licence plate

SU is an area code in 4 countries. The plate's style and country code tell them apart.

Germany
SU-AB 1234
Rhein-Sieg-Kreis (North Rhine-Westphalia)
named after Siegburg
Code details →
North Macedonia
SU 1234 AB
Struga (Southwest Statistical Region)
Code details →
Norway
SU 12345
Vestland
named after Bergen
Code details →
Serbia
SU 123-AB
Mali Iđoš (North Bačka District), Subotica (North Bačka District)
named after Subotica
Code details →