Are the ISO 3166-1 codes used in postal addressing (on envelopes etc.)?
No. ISO 3166-1 is not generally used in postal addressing as known to the end-user, i.e. the people writing addresses on letters. (However, for communication within and between the postal organizations, ISO 3166-1 is widely used for various purposes). The only countries in the world that do have a formal agreement on including a country code before the ZIP code are the members of the European Conference of Postal and Telecommunications Administrations (CEPT). Their code coincides with ISO 3166-1 only in few cases. For comprehensive information on postal addressing please use the postcode pages on the website of the Universal Postal Union.
No. ISO 3166-1 is not generally used in postal addressing as known to the end-user, i.e. the people writing addresses on letters. (However, for communication within and between the postal organizations, ISO 3166-1 is widely used for various purposes). The only countries in the world that do have a formal agreement on including a country code before the ZIP code are the members of the European Conference of Postal and Telecommunications Administrations (CEPT). Their code coincides with ISO 3166-1 only in a few cases. For more detailed information on postal addressing see the postcode pages on the website of the Universal Postal Union (UPU).
