ISO 3166

Standard codes for geographical names ISO 3166 is a standard published by the International Organization for Standardization (ISO) that defines codes for the names of countries, dependent territories, special areas of geographical interest, and their principal subdivisions (e.g., provinces or states). The official name of the standard is Codes for the representation of names of countries and their subdivisions. Parts It consists of three parts: ISO 3166-1, Codes for the representation of names of countries and their subdivisions – Part 1: Country code, defines codes for the names of countries, dependent territories, and special areas of geographical interest. It defines three sets of country codes: 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 Div