Internal Territories of Australia TerritoryAbbreviationCapitalPopulationArea Australian Capital TerritoryACTCanberra475,000910 sq mi (2,358 sq km) Northern TerritoryNTDarwin255,000548,120 sq mi (1,419,630 sq km) Jervis Bay TerritoryNSWNone45026 sq mi (68 sq km) ...