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 TO, the ISO 3166-1 alpha-2 code of Tonga. The second part is two digits (01–05).
Current codes
Subdivision names are listed as in the ISO 3166-2 standard published by the ISO 3166 Maintenance Agency (ISO 3166/MA).
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