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The sortable table below contains the three sets of ISO 3166-1 country codes for each of its 249 countries, links to the ISO 3166-2 country subdivision codes, and the Internet country code top-level domains (ccTLD) which are based on the ISO 3166-1 alpha-2 standard with the few exceptions noted. See the ISO 3166-3 standard for former country codes.
Each complete ISO 3166-2 code can then be used to uniquely identify a country subdivision in a global context. As of 23 November 2023 [update] there are 5,046 codes defined in ISO 3166-2. For some countries, codes are defined for more than one level of subdivisions.
ISO 3166-2:US is the entry for the United States in ISO 3166-2, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), which defines codes for the names of the principal subdivisions (e.g., provinces or states) of all countries coded in ISO 3166-1.
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, states, departments, regions) of all countries coded in ISO 3166-1. ISO 3166-3, Codes for the representation of names of countries and their ...
The alphabetic country codes were first included in ISO 3166 in 1974, and the numeric country codes were first included in 1981. The country codes have been published as ISO 3166-1 since 1997, when ISO 3166 was expanded into three parts, with ISO 3166-2 defining codes for subdivisions and ISO 3166-3 defining codes for former countries. [1]
The first part is GB, the ISO 3166-1 alpha-2 code of the United Kingdom. The second part is three letters, which is the British Standard BS 6879 three-letter code of the subdivision. Though GB is the United Kingdom's ISO 3166-1 alpha-2 code, UK is exceptionally reserved for the United Kingdom on the
ISO 3166-2, codes for country subdivisions; Capital districts and territories; List of terms for country subdivisions; List of national capitals serving as administrative divisions; List of autonomous areas by country; List of sovereign states
So, the most general case is a table of standard names and the corresponding standard codes (and its official geometries). Germany (DE) with each first-level administrative subdivision labelled with the second part of its ISO 3166-2 code. The 21 top-level 2-digit "region" of hydrologic unit boundaries, using the HUC geocode conventions.