Nukuʻalofa is the capital city of Tonga. It is on the island of Tongatapu. Quick Facts Country, Island ...NukuʻalofaDowntown NukuʻalofaNukuʻalofaCoordinates: 21°8′0″S 175°12′0″WCountry TongaIslandTongatapuElevation3 m (10 ft)Highest elevation6 m (20 ft)Lowest elevation0 m (0 ft)Population (2006) • Total23,658 • Estimate (2012)24,571Time zoneUTC+13 (–) • Summer (DST)UTC+14 (–)Area code676ClimateAfClose 35% of Tongans live in Nukuʻalofa. As of 1996, about 22,400 people lived there. This short article about a place or feature can be made longer. You can help Wikipedia by adding to it.