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.

ISO 3166 is an international standard which defines codes representing names of countries and their subdivisions. The standard specifies basic guidelines for the implementation and maintenance of country and subdivisions codes. Most people refer to ISO 3166, but actually it is divided into three parts.

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.

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).

Editions of ISO 3166-3: ISO 3166-3:1999, ISO 3166-3:2013. The ISO 3166 series provides universally applicable coded representations of names of countries (current and non-current), dependencies, and other areas of particular geopolitical interest and their subdivisions.

The International Organization for Standardization defines its country codes in standard 3166-1. ISO codes also consist of three capital letters in the alpha-3 version. For example, Germany has the IOC code "GER" for the English country name "Germany."

This is a complete list of all country ISO codes as described in the ISO 3166 international standard. These codes are used throughout the IT industry by computer systems and software to ease the identification of country names.

ISO 3166-1:2020 Codes for the representation of names of countries and their subdivisions Part 1: Country code

ISO 3166-1 alpha-2 codes are two-letter country codes defined in ISO 3166-1, part of the ISO 3166 standard [1] published by the International Organization for Standardization (ISO), to represent countries, dependent territories, and special areas of geographical interest.

World map detail with ISO 3166-1 alpha-2 codes in place of the names of countries. Image: kk nationsonline.org