Postal services in Andorra are unique in that they are not operated by the country itself, but by its two larger neighbouring countries,

Spain , image_flag = Bandera de España.svg , image_coat = Escudo de España (mazonado).svg , national_motto = ''Plus ultra'' (Latin)(English: "Further Beyond") , national_anthem = (English: "Royal March") , i ...

and

France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of overseas regions and territories in the Americas and the Atlantic, Pacific and Indian Oceans. Its metropolitan area ...

.Andorra
,

Universal Postal Union The Universal Postal Union (UPU, french: link=no, Union postale universelle), established by the Treaty of Bern of 1874, is a specialized agency of the United Nations (UN) that coordinates postal policies among member nations, in addition to ...

, September 2004 This is a legacy of the centuries of ''de facto'' control exercised by those two countries over

Andorra , image_flag = Flag of Andorra.svg , image_coat = Coat of arms of Andorra.svg , symbol_type = Coat of arms , national_motto = la, Virtus Unita Fortior, label=none (Latin)"United virtue is stro ...

. '' Correos'' of Spain and '' La Poste'' of France operate side by side. However the

postal code A postal code (also known locally in various English-speaking countries throughout the world as a postcode, post code, PIN or ZIP Code) is a series of letters or digits or both, sometimes including spaces or punctuation, included in a postal a ...

system, introduced in July 2004, has a different format from those of either Spain or France, consisting of the letters "AD", followed by three digits. Both postal administrations issue their own postage stamps for use in Andorra featuring unique designs, as those of Spain and France are not valid. These are used for international correspondence, as postal service within Andorra is free.''Europe Review 2003/04: The Economic and Business Report''
Kogan Page Publishers, 2003, page 11

References

Postal system of Andorra {{Andorra-stub fr:Histoire philatélique et postale de l'Andorre#Fonctionnement depuis 1931