Country code

ISO 3166-1

• a two-letter
• a three-letter, and
• a three-digit numeric code.

• for ISO 4217 currency codes and
• with deviations, for country code top-level domain names on the Internet: list of Internet TLDs.

Other country codes

• European Union:
• *Before the 2004 EU enlargement the EU used the UN Road Traffic Conventions license plate codes; since then, it uses ISO 3166-1
• *The Nomenclature des unités territoriales statistiques of the European Union, mostly focusing on subdivisions of the EU member states
• FIFA assigns a three-letter code to each of its member and non-member countries: List of FIFA country codes
• Federal Information Processing Standard 10-4 defined two-letter codes used by the U.S. government and in the CIA World Factbook: list of FIPS country codes. On September 2, 2008, FIPS 10-4 was one of ten standards withdrawn by NIST as a Federal Information Processing Standard.
• The Bureau of Transportation Statistics, part of the United States Department of Transportation, maintains its own list of codes, so-called World Area Codes, for state and country codes.
• GOST 7.67: country codes in Cyrillic from the GOST standards committee
• From the International Civil Aviation Organization :
• *The national prefixes used in aircraft registration numbers
• *Location prefixes in four-character ICAO airport codes
• International Olympic Committee three-letter codes used in sporting events: list of IOC country codes
• From the International Telecommunication Union :
• *the E.164 international telephone dialing codes: list of country calling codes with 1-3 digits,
• *the E.212 mobile country codes, for mobile/wireless phone addresses,
• *the first few characters of call signs of radio stations define the country: the ITU prefix,
• *ITU letter codes for member-countries,
• *ITU prefix - amateur and experimental stations - The International Telecommunications Union assigns national telecommunication prefixes for amateur and experimental radio use, so that operators can be identified by their country of origin. These prefixes are legally administered by the national entity to which prefix ranges are assigned.
• *Three-digit codes used to identify countries in maritime mobile radio transmissions, known as maritime identification digits
• License plates for automobiles:
• *Under the 1949 and 1968 United Nations Road Traffic Conventions : List of international license plate codes.
• *Diplomatic license plates in the United States, assigned by the U.S. State Department.
• North Atlantic Treaty Organisation used two-letter codes of its own: list of NATO country codes. They were largely borrowed from the FIPS 10-4 codes mentioned below. In 2003 the eighth edition of the Standardisation Agreement adopted the ISO 3166 three-letter codes with one exception. With the ninth edition, NATO is transitioning to four- and six-letter codes based on ISO 3166 with a few exceptions and additions
• United Nations Development Programme also has its own list of trigram country codes
• World Intellectual Property Organization : WIPO ST.3 gives two-letter codes to countries and regional intellectual property organizations
• World Meteorological Organization has its own list of country codes, used in reporting meteorological observations
• UIC : UIC Country Codes

Other codings

• The initial digits of International Standard Bookik saer are group identifiers for countries, areas, or language regions.
• The first three digits of GS1 Company Prefixes used to identify products, for example, in barcodes, designate numbering agencies.

  Lists of country codes by country