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Country codes are defined by the International Telecommunication Union (ITU) in ITU-T standards E.123 and E.164. The prefixes enable international direct dialing (IDD). Country codes constitute the international telephone numbering plan. They are used only when dialing a telephone number in a country or world region other than the caller's.
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.
This is a list of FIPS 10-4 country codes for Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions. The two-letter country codes were used by the US government for geographical data processing in many publications, such as the CIA World Factbook .
U.S. Census Bureau regions and divisions. Since 1950, the United States Census Bureau defines four statistical regions, with nine divisions. [1] [2] The Census Bureau region definition is "widely used... for data collection and analysis", [3] and is the most commonly used classification system.
List of autonomous areas by country; List of sovereign states; List of political and geographic subdivisions by total area, comparing continents, countries, and first-level administrative country subdivisions. List of first-level administrative divisions by population; List of FIPS region codes in FIPS 10-4, withdrawn from the Federal ...
Out of the 676 possible pairs of regional indicator symbols (26 × 26), only 270 are considered valid Unicode region codes. These are a subset of the region sequences in the Common Locale Data Repository (CLDR): [6] [7] [8] All 256 regular region sequences in the CLDR 249 officially assigned ISO 3166-1 alpha-2 codes
The list of names in Country and Region Codes for Statistical Use of the UN Statistics Division is based on the bulletin Country Names and other UN sources. Once a country name or territory name appears in either of these two sources, it will be added to ISO 3166-1 by default.
The format of the ISO 3166-2 codes is different for each country. The codes may be alphabetic, numeric, or alphanumeric, and they may also be of constant or variable length. The following is a table of the ISO 3166-2 codes of each country (those with codes defined), grouped by their format: [citation needed]