Tonga Government About PICTs - GovernmentNational Constitutional Monarchy, UN Member State (1999), Member of the Commonwealth (1970) Capital About PICTs - CapitalNuku'alofa Population Mid-year population estimate103,972 2025 Land area Land area720 km² Max height above sea level About PICTs - Max height above sea level1,033 m EEZ area About PICTs - EEZ area659,558 km² Currency About PICTs - CurrencyTongan Pa'anga (TOP) Languages About PICTs - LanguagesEnglish, Tongan GDP per capita (USD) Gross Domestic Product per capita$4,858 2023 Useful links Government of the Kingdom of Tonga The Kingdom of Tonga: the true South Pacific Demographic assessment of exploited coastal finfish species of Tongatapu, Tonga Pacific Community Membership About PICTs - Pacific Community Membership1983