Los prefijos de Tonga (códigos de área):
| Ciudad/pueblo o región | Prefijo | |
|---|---|---|
| 1. | Nakulo | 35 |
| 2. | Nakulo | 36 |
| 3. | Neiafu | 70 |
| 4. | Neiafu | 71 |
| 5. | Neiafu | 74 |
| 6. | Neiafu | 79 |
| 7. | Niuafo'ou | 80 |
| 8. | Niuatoputapu | 85 |
| 9. | Nuku'alofa | 20 |
| 10. | Nuku'alofa | 21 |
| 11. | Nuku'alofa | 22 |
| 12. | Nuku'alofa | 23 |
| 13. | Nuku'alofa | 24 |
| 14. | Nuku'alofa | 25 |
| 15. | Nuku'alofa | 26 |
| 16. | Nuku'alofa | 27 |
| 17. | Nuku'alofa | 28 |