User-assigned code elements are codes at the disposal of users who need to add further names of countries, territories, or other geographical entities to their in-house application of ISO 3166-1, and the ISO 3166/MA will never use these codes when updating the standard. These codes can be user-assigned:
* Alpha-2: , to , to , and
* Alpha-3: to , to , to , and to
* Numeric: to

User-assigned codes in wide use