ISO 3166

ISO 3166 is a three-part standard for coding the names of countries and dependent areas, and the principal subdivisions thereof.

ISO 3166-1 codes for country and dependent area names, first published in 1974
- ISO 3166-1 alpha-2 the famous two-letter country codes
- ISO 3166-1 alpha-3 three-letter country codes
- ISO 3166-1 numeric
ISO 3166-2 defines codes for the principal subdivisions of a country or dependent area.
- ISO 3166-2:2000-06-21 Newsletter I-1
- ISO 3166-2:2002-05-21 Newsletter I-2
- ISO 3166-2:2002-08-20 Newsletter I-3
- ISO 3166-2:2002-12-10 Newsletter I-4
ISO 3166-3 defines codes for superseded ISO 3166-1 codes, first published in 1998.

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