ISO

The codes in ISO 3166 are available on the Online Browsing Platform. The information on the OBP is always up to date and you can sign up for notifications to be informed when changes are made by clicking on the follow function in the top right-hand corner.

Users of ISO country codes can consult an archive of changes to the standard on our server.

We also have a product, the Country Codes Collection, which you can preview free of charge on the OBP (where you will also find a decoding table). It contains the codes from Parts 1, 2 and 3 of ISO 3166 in three different formats (.xml, .csv, and .xls) for easy integration into your own systems. You will be notified when changes are made so you can download the latest versions. In this way, you can be sure that your database is always using the most up-to-date information from ISO.

ISO 3166 has three parts: codes for countries, codes for subdivisions and formerly used codes (codes that were once used to describe countries but are no longer in use).

The country codes can be represented either as a two-letter code (alpha-2) which is recommended as the general-purpose code, a three-letter code (alpha-3) which is more closely related to the country name and a three-digit numeric code (numeric-3) which can be useful if you need to avoid using Latin script.

The codes for subdivisions are represented as the alpha-2 code for the country, followed by up to three characters. For example ID-RI is the Riau province of Indonesia and NG-RI is the Rivers province in Nigeria. Names and codes for subdivisions are usually taken from relevant official national information sources.

The formerly used codes are four-letter codes (alpha-4). How the alpha-4 codes are constructed depends on the reason why the country name has been removed.

Read more about the different types of codes in the Glossary for ISO 3166.