The Area Codes of Tonga: City/Town or RegionArea code 1.Nakulo35 (+676 35) 2.Nakulo36 (+676 36) 3.Neiafu70 (+676 70) 4.Neiafu71 (+676 71) 5.Neiafu74 (+676 74) 6.Neiafu79 (+676 79) 7.Niuafo'ou80 (+676 80) 8.Niuatoputapu85 (+676 85) 9.Nuku'alofa20 (+676 20) 10.Nuku'alofa21 (+676 21) 11.Nuku'alofa22 (+676 22) 12.Nuku'alofa23 (+676 23) 13.Nuku'alofa24 (+676 24) 14.Nuku'alofa25 (+676 25) 15.Nuku'alofa26 (+676 26) 16.Nuku'alofa27 (+676 27) 17.Nuku'alofa28 (+676 28)