Poste Vaticane manages the sovereign postal system of the world's smallest independent state, operating independently from the Italian network. While the Vatican maintains its own stamps and post offices, it utilizes a specific five-digit code for compatibility with global sorting standards. This system ensures efficient delivery to the various dicasteries and administrative offices within the Holy See.
The Vatican City system uses a single, fixed five-digit numeric code. Although it appears similar to the Italian CAP system, it is exclusively reserved for the territory of Vatican City.