The map above shows Oklahoma and South Australia side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Oklahoma vs South Australia Geography
Land area: Oklahoma has a land area of 68,597 square miles (177,665 km²), while South Australia has 380,048 square miles (984,321 km²). South Australia's land area is 5.5 times (454%) larger than Oklahoma's.
Total area: Oklahoma: 69,899 square miles (181,038 km²) vs South Australia: 380,048 square miles (984,321 km²), including inland and coastal water. South Australia's total area is 5.4 times (444%) larger than Oklahoma's.
Length: Oklahoma is 533 miles (857 km) long from north to south; South Australia is 1,078 miles (1,735 km). South Australia's north-south length is 2.0 times (102%) longer than Oklahoma's.
Width: Oklahoma spans 490 miles (789 km) east to west; South Australia spans 825 miles (1,328 km). South Australia's east-west width is 1.7 times (68%) wider than Oklahoma's.
Highest point: Oklahoma's highest point is Black Mesa at 4,980 feet (1,518 m); South Australia's is Mount Woodroffe at 4,708 feet (1,435 m). Black Mesa is 272 feet higher than Mount Woodroffe.
Lowest point: Oklahoma's lowest point is Little River at 289 feet; South Australia's is Lake Eyre at -49 feet. South Australia's lowest point is 338 feet lower.
Oklahoma vs South Australia Population and History
Population: Oklahoma has a population of 4,095,393 (2024), while South Australia has 1,908,182 (2025). Oklahoma's population is 2.1 times (115%) larger than South Australia's.
Population density: Oklahoma: 59.7 people per square mile vs South Australia: 5.0. Oklahoma's population density is 11.9 times higher than South Australia's.
Largest metro area: Oklahoma's largest metropolitan area is Oklahoma City, OK metro area (1,497,821 people) vs South Australia's Greater Adelaide (1,491,015). Oklahoma City, OK metro area and Greater Adelaide have about the same population.
History: Oklahoma: Admitted to the Union on November 16, 1907, as the 46th state. South Australia: Became an Australian state at Federation on January 1, 1901; founded as a colony in 1836. In its current form, South Australia is the older of the two by 6 years.
Oklahoma vs South Australia Economy
GDP: Oklahoma's GDP is $263.7 billion (2024) vs South Australia's $100.2 billion. Oklahoma's economic output is 2.6 times (163%) larger than South Australia's.
GDP per capita: Oklahoma: $64,388 per person vs South Australia: $52,511. Oklahoma's GDP per capita is 1.2 times (23%) higher than South Australia's.
Official Websites
Oklahoma official website · South Australia official website
More Size Comparisons
All Oklahoma 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.