The map above shows Missouri and South Australia side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Missouri vs South Australia Geography
Land area: Missouri has a land area of 68,746 square miles (178,052 km²), while South Australia has 380,048 square miles (984,321 km²). South Australia's land area is 5.5 times (453%) larger than Missouri's.
Total area: Missouri: 69,707 square miles (180,540 km²) vs South Australia: 380,048 square miles (984,321 km²), including inland and coastal water. South Australia's total area is 5.5 times (445%) larger than Missouri's.
Length: Missouri is 328 miles (529 km) long from north to south; South Australia is 1,078 miles (1,735 km). South Australia's north-south length is 3.3 times (229%) longer than Missouri's.
Width: Missouri spans 437 miles (703 km) east to west; South Australia spans 825 miles (1,328 km). South Australia's east-west width is 1.9 times (89%) wider than Missouri's.
Highest point: Missouri's highest point is Taum Sauk Mountain at 1,771 feet (540 m); South Australia's is Mount Woodroffe at 4,708 feet (1,435 m). Mount Woodroffe is 2,937 feet higher than Taum Sauk Mountain.
Lowest point: Missouri's lowest point is St. Francis River at 230 feet; South Australia's is Lake Eyre at -49 feet. South Australia's lowest point is 279 feet lower.
Missouri vs South Australia Population and History
Population: Missouri has a population of 6,245,466 (2024), while South Australia has 1,908,182 (2025). Missouri's population is 3.3 times (227%) larger than South Australia's.
Population density: Missouri: 90.8 people per square mile vs South Australia: 5.0. Missouri's population density is 18.2 times higher than South Australia's.
Largest metro area: Missouri's largest metropolitan area is St. Louis, MO-IL metro area (2,811,927 people) vs South Australia's Greater Adelaide (1,491,015). St. Louis, MO-IL metro area's population is 1.9 times (89%) larger than Greater Adelaide's.
History: Missouri: Admitted to the Union on August 10, 1821, as the 24th state. South Australia: Became an Australian state at Federation on January 1, 1901; founded as a colony in 1836. In its current form, Missouri is the older of the two by 80 years.
Missouri vs South Australia Economy
GDP: Missouri's GDP is $448.7 billion (2024) vs South Australia's $100.2 billion. Missouri's economic output is 4.5 times (348%) larger than South Australia's.
GDP per capita: Missouri: $71,846 per person vs South Australia: $52,511. Missouri's GDP per capita is 1.4 times (37%) higher than South Australia's.
Official Websites
Missouri official website · South Australia official website
More Size Comparisons
All Missouri size comparisons · All South 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.