ISO 3166

ISO 3166. It is an international standard published by the International Organization for Standardization that defines codes for the names of countries, dependent territories, and special areas of geographical interest. The standard, first published in 1974, also includes codes for their principal subdivisions, such as states or provinces. These codes are used widely in data processing, communications, and international trade to provide a universally recognized method of identifying geopolitical entities.

Overview

The primary purpose of the standard is to establish a consistent framework for the unambiguous identification of nations and their administrative divisions across various systems and applications. It was developed to address the challenges posed by different naming conventions and language barriers in global data exchange. The codes are designed to be independent of the country names themselves, which can change due to political events like the dissolution of Czechoslovakia or the Partition of India. This independence ensures stability in data systems, even as geopolitical landscapes evolve, such as during the breakup of Yugoslavia or the reunification of Germany. The maintenance of the standard is managed by the ISO/TC 46 technical committee, specifically its ISO 3166/MA maintenance agency.

Parts and structure

The standard is divided into several distinct parts, each serving a specific coding purpose. Part 1 defines two-letter, three-letter, and three-digit numeric codes for countries and territories; for instance, France is assigned FR, FRA, and 250. Part 2 provides codes for the representation of names of country subdivisions, such as states for the United States or länder for Germany. Part 3 establishes codes for formerly used names of countries, which is crucial for historical data referencing entities like Tanganyika or British Honduras. Each code set is published in a list that includes the short name in English and French, as defined by the United Nations Terminology Unit.

Maintenance and updates

The standard is actively maintained through a defined process managed by the ISO 3166/MA maintenance agency. Updates are issued via newsletters to account for geopolitical changes, such as new national independence as seen with South Sudan or Timor-Leste, or changes in administrative subdivisions. The agency, whose secretariat is provided by the German Institute for Standardization, evaluates change requests submitted by United Nations members or national standards bodies like Standards Australia. Decisions often follow recognition by bodies such as the United Nations General Assembly or the International Olympic Committee. A historical summary of changes is published, documenting events like the renaming of Swaziland to Eswatini.

Uses and applications

These codes are integral to a vast array of international systems and protocols. They form the foundation for country code top-level domains on the Internet, such as .uk for the United Kingdom and .jp for Japan, administered by the Internet Assigned Numbers Authority. They are used in international vehicle registration codes, like GB for the United Kingdom, and in currency codes defined by ISO 4217, where the country code is a prefix. Other critical applications include addressing for the Universal Postal Union, nationality designators in machine-readable passports governed by the International Civil Aviation Organization, and statistical reporting for organizations like the World Bank and the International Monetary Fund.

Related standards

Several other International Organization for Standardization standards extend or rely upon this coding system. ISO 4217 for currency codes incorporates these codes as a base, as seen with USD for the United States dollar. ISO 639 for language codes is often used in conjunction with it to define locales. ISO 15924 for script codes and ISO 3166-2 for regional subdivisions are directly complementary. Other related geocode standards include ISO 19112 for geographic information and the UN/LOCODE system maintained by the United Nations Economic Commission for Europe for ports and locations.

Category:ISO standards Category:Country codes Category:Technical communication