Postal services in Andorra are unique in that they are not operated by the Principality itself, but its two larger neighbouring countries, Spain and France. This is a legacy of the centuries of de facto control exercised by those two countries over Andorra. Today Correos of Spain and La Poste of France operate side by side; Spanish post boxes being red and French ones being yellow.

Both postal administrations issue their own postage stamps for use in Andorra - those of Spain and France are not valid. Andorran stamps feature unique designs, often featuring the country's two co-princes or joint heads of state, the President of France and the Bishop of Urgell in Spain. Mail to addresses within the Principality is delivered free of charge.

Introduction of Post Codes

Until 2004, Andorra had no post codes, but in that year, in cooperation with both countries' postal administrations, these were finally introduced, with each of the seven parish in the principality having its own post code, (or codi postal in Catalan).

Parish	Post Code
Canillo	AD100
Encamp	AD200
Ordino	AD300
La Massana	AD400
Andorra la Vella	AD500
Sant Julià de Lòria	AD600
Escaldes-Engordany	AD700

PO Box addresses require different post codes, ending in the digit '1', so, for example, a letter sent to a PO Box address in Andorra la Vella would require the post code AD501.