Codes used in several countries
OK on a licence plate
OK is an area code in 3 countries. The plate's style and country code tell them apart.
Germany
OK-AB 1234Code details →Börde (Saxony-Anhalt)
named after Ohrekreis
Greece
OK-1234Code details →Athens
Poland
OK 12345Code details →powiat kędzierzyńsko-kozielski (Opole)
Germany
Greece
Poland