ISO 3166-2:TO
ISO 3166-2:TO is the entry for Tonga in ISO 3166-2, part of the ISO 3166 standard published by the International Organization for Standardization, which defines codes for the names of the principal subdivisions of all countries coded in ISO 3166-1.
Currently for Tonga, ISO 3166-2 codes are defined for 5 divisions. Each code consists of two parts, separated by a hyphen. The first part is, the ISO 3166-1 alpha-2 code of Tonga. The second part is two digits.
Current codes
Subdivision names are listed as in the ISO 3166-2 standard published by the ISO 3166 Maintenance Agency.Click on the button in the header to sort each column.
| Code | Subdivision name |
| 'Eua | |
| Ha'apai | |
| Niuas | |
| Tongatapu | |
| Vava'u |
Changes
The following changes to the entry have been announced in newsletters by the ISO 3166/MA since the first publication of ISO 3166-2 in 1998:| Newsletter | Date issued | Description of change in newsletter | Code/Subdivision change |
| Addition of the administrative subdivisions and of their code elements | Subdivisions added: 5 divisions |