Australia Government Representative democracy and constitutional monarchy; UN Member State (1945); Member of the Commonwealth (1931) Capital Canberra Population 25 400 000 Land area 7 700 000 km² Max height above sea level 2 228 m EEZ 8 200 000 km² GDP Year 2020 Currency Australian dollar (AUD) Languages English GDP per capita 53 321 USD Useful links Department of Foreign Affairs and Trade Australia and Pacific Islands regional organisations Government Visit Australia Pacific Community Membership 1947