The map above shows South Australia and Western Australia side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
South Australia vs Western Australia Geography
Land area
- South Australia has a land area of 380,048 square miles (984,321 km²), while Western Australia has 975,685 square miles (2,527,013 km²).
- Western Australia's land area is 2.6 times (157%) larger than South Australia's.
Total area
- South Australia: 380,048 square miles (984,321 km²) vs Western Australia: 975,685 square miles (2,527,013 km²), including inland and coastal water.
- Western Australia's total area is 2.6 times (157%) larger than South Australia's.
Length
- South Australia is 1,078 miles (1,735 km) long from north to south; Western Australia is 1,590 miles (2,558 km).
- Western Australia's north-south length is 1.5 times (47%) longer than South Australia's.
Width
- South Australia spans 825 miles (1,328 km) east to west; Western Australia spans 1,286 miles (2,069 km).
- Western Australia's east-west width is 1.6 times (56%) wider than South Australia's.
Highest point
- South Australia's highest point is Mount Woodroffe at 4,708 feet (1,435 m); Western Australia's is Mount Meharry at 4,098 feet (1,249 m).
- Mount Woodroffe is 610 feet higher than Mount Meharry.
Lowest point
- South Australia's lowest point is Lake Eyre at -49 feet; Western Australia's is Indian Ocean at 0 feet.
- South Australia's lowest point is 49 feet lower.
South Australia vs Western Australia Population and History
Population
- South Australia has a population of 1,908,182 (2025), while Western Australia has 3,061,672 (2025).
- Western Australia's population is 1.6 times (60%) larger than South Australia's.
Population density
- South Australia: 5.0 people per square mile vs Western Australia: 3.1.
- South Australia's population density is 1.6 times (61%) higher than Western Australia's.
Largest metro area
- South Australia's largest metropolitan area is Greater Adelaide (1,491,015 people) vs Western Australia's Greater Perth (2,452,765).
- Greater Perth's population is 1.6 times (65%) larger than Greater Adelaide's.
History
- South Australia: Became an Australian state at Federation on January 1, 1901; founded as a colony in 1836.
- Western Australia: Became an Australian state at Federation on January 1, 1901; founded as a colony in 1829.
South Australia vs Western Australia Economy
GDP
- South Australia's GDP is $100.2 billion (2025) vs Western Australia's $304.6 billion.
- Western Australia's economic output is 3.0 times (204%) larger than South Australia's.
GDP per capita
- South Australia: $52,511 per person vs Western Australia: $99,488.
- Western Australia's GDP per capita is 1.9 times (89%) higher than South Australia's.
Official Websites
South Australia official website · Western Australia official website
Download the South Australia vs Western Australia Size Comparison Map for free
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More Size Comparisons
All South Australia size comparisons · All Western Australia size comparisons
Area, elevation and boundary figures come from official national statistics and US Census Bureau and Natural Earth boundary data; US state population, economic, county and tax figures come from the US Census Bureau, the Bureau of Economic Analysis and the Tax Foundation. Figures are rounded and for general reference.