Postal services in the Principality of Andorra are unique as they are co-managed by the Spanish (Correos) and French (La Poste) postal administrations. To standardize delivery, Andorra uses a five-character alphanumeric system that covers its seven parishes. This specialized format ensures that international mail is correctly routed through the high-altitude Pyrenean terrain regardless of the carrier.
The Andorran Codi Postal consists of the country prefix \"AD\" followed by three digits. The third digit (the first number) identifies the parish, such as 5 for Andorra la Vella or 7 for Escaldes-Engordany.