Short answer: around 86% of Australians live within 50 km of the coast, and around two-thirds live in just six cities — Sydney, Melbourne, Brisbane, Perth, Adelaide and the Gold Coast. The Australian Bureau of Statistics 2024 Population Estimates show this is one of the most-concentrated population distributions of any developed country relative to the country’s land area.
The numbers explain a lot about how Australia actually works.
The Population Concentration Numbers
Australia’s total population (June 2024 ABS estimate): approximately 27 million.
Population by major city (Greater Capital City Statistical Areas, 2024):
- Greater Sydney: 5.4 million (20% of national population)
- Greater Melbourne: 5.2 million (19%)
- Greater Brisbane: 2.7 million (10%)
- Greater Perth: 2.3 million (8.5%)
- Greater Adelaide: 1.4 million (5%)
- Gold Coast: 720,000 (2.7%)
The top six urban areas account for around 65% of the national population. The remaining 35% is spread across the rest of the country, with population concentrated in coastal regional cities (Newcastle, Wollongong, Sunshine Coast, Geelong, Hobart, Cairns, Townsville).
Why the Coastal Concentration
The “86% within 50 km of the coast” figure is structural, driven by:
- Climate — the Australian interior is hot and arid; the coastal strip in the south-east is temperate
- Water — the inland rivers are seasonal; coastal rivers and rainfall support the major cities
- History — European settlement was coastal; colonial port cities anchored each state’s population
- Industry — modern services and manufacturing are concentrated in coastal cities; mining is the major exception (and miners often fly in/fly out from coastal homes)
The Sparsely-Populated Interior
Outside the coastal cities and a thin strip of agricultural country, Australia’s interior is among the most sparsely-populated land on Earth. The Pilbara region (north-west WA) covers an area larger than the UK with a population around 60,000. The Northern Territory has 250,000 people in 1.4 million square kilometres — an area three times the size of Germany.
Outback population centres: Alice Springs (NT, 27,000), Mount Isa (QLD, 18,000), Broken Hill (NSW, 17,000), Longreach (QLD, 3,000), Coober Pedy (SA, 1,800).
The South-East Corridor
The “south-east corridor” — roughly Brisbane to Adelaide via Sydney, Melbourne and Canberra — contains:
- Around 75% of Australia’s population
- The four largest cities
- The federal capital
- The bulk of manufacturing, finance, services, education
- All but two of the country’s universities
The corridor is around 2,500 km long but most of the population sits within 100 km of the coast.
Tasmania, Northern Territory, ACT
Tasmania: 575,000 people in 68,000 square kilometres (similar to Latvia in area). Most concentrated in Hobart and Launceston.
ACT: 470,000 people, almost all in Canberra.
NT: 252,000 people. Darwin (~150,000) is the largest centre.
These three smaller jurisdictions account for less than 5% of national population.
Indigenous Population Distribution
Aboriginal and Torres Strait Islander Australians (around 3.8% of national population per ABS 2021) are more dispersed than the non-Indigenous population. NT, far north QLD and remote WA have higher Indigenous population shares; the largest absolute Indigenous populations are in NSW and QLD.
Migration and Population Growth
Australia’s population growth is among the fastest in the developed world, driven by net migration. In 2024, net overseas migration added approximately 500,000 people, about 70% of national population growth. Most migrants settle in Sydney and Melbourne first; secondary settlement spreads to Brisbane, Perth, and the Gold Coast.
What This Means for You
For a tourist trying to understand Australia’s geography: think of Australia as a thin coastal arc with heavy population concentration in the south-east, plus a thinly-populated interior the size of the European Union.
For a UK migrant: Sydney, Melbourne and Brisbane are the realistic settlement options; almost all UK migrants are in one of those three within their first year. See where do most Brits live in Australia.
The Australian Bureau of Statistics 3218.0 Regional Population release is the authoritative source for population distribution data quoted here.