** ISO 3166-1 alpha-2 – two-letter country codes which are the most widely used of the three, and used most prominently for the Internet's country code top-level domains ( with a few exceptions ).

** ISO 3166-1 alpha-3 – three-letter country codes which allow a better visual association between the codes and the country names than the alpha-2 codes.

** ISO 3166-1 numeric – three-digit country codes which are identical to those developed and maintained by the United Nations Statistics Division, with the advantage of script ( writing system ) independence, and hence useful for people or systems using non-Latin scripts.

** ISO 639

** " ROM ", the ISO 639 alpha-2 designation of the Romani language

** DM, the nation's ISO 3166-1 alpha-2 code

** Macedonian language, ISO 639 digram

** ISO / IEC TR 21000-1: 2004

** ISO / IEC 21000-2: 2005

** ISO / IEC 21000-8: 2005

** California ISO,

** Reserved code elements under ISO 3166-1 " Codes for the representation of names of countries and their subdivisions – Part 1: Country codes ", available on request from ISO 3166 / MA

** Countries or areas, codes and abbreviations — list of alpha-3 and numeric codes ( a few territories officially assigned codes in ISO 3166-1 are not included in this list )

** Appendix D – Cross-Reference List of Country Data Codes — comparison of FIPS 10, ISO 3166, and STANAG 1059 country codes

** Country codes — comparison of ISO 3166-1 country codes with other country codes

** ISO 3166-1 Change History

** ISO 3166-1 alpha-2, FIPS Pub 10-4 and obsolete NATO digram ( CA )

** Portuguese language ISO 639 alpha-2 code

** French language fr, by ISO 639 alpha-2 code

** 2-letter country code in ISO 3166-1 alpha-2 standard

** Indonesian language, ISO 639 alpha-2 code id

** Its two-letter country code defined in ISO 3166-1 alpha-2

** The prefix for Brazil's ISO 3166-2 subdivision codes

** Bulgarian language ( bg ), ISO 639 alpha-2 language code

** ISO 3166-1 alpha-2 country code for Canada: CA

** ISO 3166-1 alpha-3 country code for Canada: CAN

** ISO 3166-1 alpha-2 country code for Anguilla: AI

** ISO 3166-1 alpha-3 country code for Anguilla: AIA

** ISO 3166-1 alpha-2 country code for Antigua and Barbuda: AG

** ISO 3166-1 alpha-3 country code for Antigua and Barbuda: ATG

** ISO 3166-1 alpha-2 country code for Aruba: AW

** ISO 3166-1 alpha-3 country code for Aruba: ABW

** ISO 3166-1 alpha-2 country code for Puerto Rico: PR

** ISO 3166-1 alpha-3 country code for Puerto Rico: PRI

** The ISO 3166-1 3-letter abbreviation for the United Kingdom

** ISO 3166-1 Alpha-2: UA ; ISO 3166-1 Alpha-3: UKR ; ISO 3166-1 Numeric: 804 ; ITU: UP

** Latin country code in ISO 3166-1 alpha-3 standard

Australian English ( AusE, AuE, AusEng, en-AU < ref > is the language code for Australian English, as defined by ISO standards ( see ISO 639-1 and ISO 3166-1 alpha-2 ) and Internet standards ( see IETF language tag ).</ ref >) is a major variety of the English language and is used throughout Australia.

* Andorra, by ISO 3166-1 country code

* Aruba, by ISO 3166-1 2-letter country code

* Azerbaijan, a Eurasian country, designated by the 2-letter ISO 3166-1 country code

* Saint Barthélemy using ISO 3166-1 alpha-3 country code

* Belgium's ISO 3166-1 and FIPS 10-4 country code

British English ( or BrEn, BrE, BE, en-UK or en-GB )< ref > is the language code for British English, as defined by ISO standards ( see ISO 639-1 and ISO 3166-1 alpha-2 ) and Internet standards ( see IETF language tag ).</ ref > is the broad term used to distinguish the forms of the English language used in the United Kingdom from forms used elsewhere.

In general, the three-letter code uses the ISO 3166-1 country code for the first two letters and the first letter of the name of the currency ( D for dollar, for instance ) as the third letter.

Canadian English ( CanE, CE, en-CA < ref > is the language code for Canadian English, as defined by ISO standards ( see ISO 639-1 and ISO 3166-1 alpha-2 ) and Internet standards ( see IETF language tag ).</ ref >) is the variety of English spoken in Canada.

* Democratic Republic of the Congo's ISO 3166-1 alpha-2 country code

* ISO 3166-1, Codes for the representation of names of countries and their subdivisions – Part 1: Country codes, defines codes for the names of countries, dependent territories, and special areas of geographical interest.

* ISO 3166-2, Codes for the representation of names of countries and their subdivisions – Part 2: Country subdivision code, defines codes for the names of the principal subdivisions ( e. g., provinces or states ) of all countries coded in ISO 3166-1.

* ISO 3166-3, Codes for the representation of names of countries and their subdivisions – Part 3: Code for formerly used names of countries, defines codes for country names which have been deleted from ISO 3166-1 since its first publication in 1974.

The other five are representatives of major United Nations agencies or other international organizations who are all users of ISO 3166-1: