The map above shows Ohio and South Australia side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Ohio vs South Australia Geography
Land area
- Ohio has a land area of 40,859 square miles (105,824 km²), while South Australia has 380,048 square miles (984,321 km²).
- South Australia's land area is 9.3 times (830%) larger than Ohio's.
Total area
- Ohio: 44,826 square miles (116,098 km²) vs South Australia: 380,048 square miles (984,321 km²), including inland and coastal water.
- South Australia's total area is 8.5 times (748%) larger than Ohio's.
Length
- Ohio is 291 miles (468 km) long from north to south; South Australia is 1,078 miles (1,735 km).
- South Australia's north-south length is 3.7 times (270%) longer than Ohio's.
Width
- Ohio spans 317 miles (510 km) east to west; South Australia spans 825 miles (1,328 km).
- South Australia's east-west width is 2.6 times (160%) wider than Ohio's.
Highest point
- Ohio's highest point is Campbell Hill at 1,547 feet (472 m); South Australia's is Mount Woodroffe at 4,708 feet (1,435 m).
- Mount Woodroffe is 3,161 feet higher than Campbell Hill.
Lowest point
- Ohio's lowest point is Ohio River at 455 feet; South Australia's is Lake Eyre at -49 feet.
- South Australia's lowest point is 504 feet lower.
Ohio vs South Australia Population and History
Population
- Ohio has a population of 11,883,304 (2024), while South Australia has 1,908,182 (2025).
- Ohio's population is 6.2 times (523%) larger than South Australia's.
Population density
- Ohio: 290.8 people per square mile vs South Australia: 5.0.
- Ohio's population density is 58.2 times higher than South Australia's.
Largest metro area
- Ohio's largest metropolitan area is Cincinnati, OH-KY-IN metro area (2,302,815 people) vs South Australia's Greater Adelaide (1,491,015).
- Cincinnati, OH-KY-IN metro area's population is 1.5 times (54%) larger than Greater Adelaide's.
History
- Ohio: Admitted to the Union on March 1, 1803, as the 17th state.
- South Australia: Became an Australian state at Federation on January 1, 1901; founded as a colony in 1836.
- In its current form, Ohio is the older of the two by 98 years.
Ohio vs South Australia Economy
GDP
- Ohio's GDP is $923.1 billion (2024) vs South Australia's $100.2 billion.
- Ohio's economic output is 9.2 times (821%) larger than South Australia's.
GDP per capita
- Ohio: $77,684 per person vs South Australia: $52,511.
- Ohio's GDP per capita is 1.5 times (48%) higher than South Australia's.
Official Websites
Ohio official website · South Australia official website
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More Size Comparisons
All Ohio 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.