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
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.