The two-letter country codes are used by the U.S. Government for geographical data processing in many publications, such as the CIA World Factbook. The standard is also known as DAFIF 0413 ed 7 Amdt. No. 3 (Nov 2003) and as DIA 65-18 (Defense Intelligence Agency, 1994, "Geopolitical Data Elements and Related Features").
The FIPS 10-4 codes are similar to (but sometimes incompatible with) the ISO 3166-1 alpha-2 country codes. The standard also includes codes for the top-level subdivision of the countries, similar to but usually incompatible with the ISO 3166-2 standard. The ISO 3166 codes are used by the United Nations and for Internet top-level country code domains.
Non-sovereign entities are in parentheses.
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Resources - See also
The complete standard can be found at:
Updates to the standard are at