The map above shows Ohio and South Dakota side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Ohio vs South Dakota Geography
Land area
- Ohio has a land area of 40,859 square miles (105,824 km²), while South Dakota has 75,808 square miles (196,342 km²).
- South Dakota's land area is 1.9 times (86%) larger than Ohio's.
Total area
- Ohio: 44,826 square miles (116,098 km²) vs South Dakota: 77,116 square miles (199,729 km²), including inland and coastal water.
- South Dakota's total area is 1.7 times (72%) larger than Ohio's.
Length
- Ohio is 291 miles (468 km) long from north to south; South Dakota is 443 miles (712 km).
- South Dakota's north-south length is 1.5 times (52%) longer than Ohio's.
Width
- Ohio spans 317 miles (510 km) east to west; South Dakota spans 371 miles (597 km).
- South Dakota's east-west width is 1.2 times (17%) wider than Ohio's.
Highest point
- Ohio's highest point is Campbell Hill at 1,547 feet (472 m); South Dakota's is Black Elk Peak at 7,198 feet (2,194 m).
- Black Elk Peak is 5,651 feet higher than Campbell Hill.
Lowest point
- Ohio's lowest point is Ohio River at 455 feet; South Dakota's is Big Stone Lake at 966 feet.
- Ohio's lowest point is 511 feet lower.
Ohio vs South Dakota Population and History
Population
- Ohio has a population of 11,883,304 (2024), while South Dakota has 924,669 (2024).
- Ohio's population is 12.9 times larger than South Dakota's.
Population density
- Ohio: 290.8 people per square mile vs South Dakota: 12.2.
- Ohio's population density is 23.8 times higher than South Dakota's.
Biggest city
- Ohio's biggest city is Columbus with 933,263 people; South Dakota's is Sioux Falls with 209,289.
- Columbus' population is 4.5 times (346%) larger than Sioux Falls'.
Largest metro area
- Ohio's largest metropolitan area is Cincinnati, OH-KY-IN metro area (2,302,815 people) vs South Dakota's Sioux Falls, SD-MN metro area (308,266).
- Cincinnati, OH-KY-IN metro area's population is 7.5 times (647%) larger than Sioux Falls, SD-MN metro area's.
History
- Ohio: Admitted to the Union on March 1, 1803, as the 17th state.
- South Dakota: Admitted to the Union on November 2, 1889, as the 40th state.
- In its current form, Ohio is the older of the two by 86 years.
Ohio vs South Dakota Economy
GDP
- Ohio's GDP is $923.1 billion (2024) vs South Dakota's $76.8 billion.
- Ohio's economic output is 12.0 times larger than South Dakota's.
GDP per capita
- Ohio: $77,684 per person vs South Dakota: $83,052.
- South Dakota's GDP per capita is 1.1 times (7%) higher than Ohio's.
Average income
- Ohio: $64,464 vs South Dakota: $75,699 average income per person (per capita personal income).
- South Dakota's average income is 1.2 times (17%) higher than Ohio's.
Ohio vs South Dakota Counties
Number of counties
- Ohio has 88 counties, while South Dakota has 66.
- Ohio's county count is 1.3 times (33%) higher than South Dakota's.
Biggest county by area
- Ohio's largest county is Ashtabula County at 702 square miles; South Dakota's is Meade County at 3,471 square miles.
- Meade County's land area is 4.9 times (394%) larger than Ashtabula County's.
Smallest county by area
- Ohio: Lake County (229 sq mi) vs South Dakota: Clay County (412 sq mi).
- Clay County's land area is 1.8 times (80%) larger than Lake County's.
Most populous county
- Ohio: Franklin County (1,356,303 people) vs South Dakota: Minnehaha County (208,639 people).
- Franklin County's population is 6.5 times (550%) larger than Minnehaha County's.
Least populous county
- Ohio: Vinton County (12,545 people) vs South Dakota: Jones County (874 people).
- Vinton County's population is 14.4 times larger than Jones County's.
Richest county
- Ohio: Delaware County ($96,573 per capita income) vs South Dakota: Union County ($146,712).
- Union County's income is 1.5 times (52%) richer than Delaware County's.
Poorest county
- Ohio: Noble County ($34,940 per capita income) vs South Dakota: Ziebach County ($32,778).
- Noble County's income is 1.1 times (7%) richer than Ziebach County's.
Ohio vs South Dakota Taxes
State income tax
- Ohio has a top income tax rate of 2.75%, while South Dakota has no state income tax.
- Ohio's top rate is 2.75 percentage points higher.
Property tax
- Ohio: 1.22% effective rate vs South Dakota: 1.02% of home value per year.
- Ohio's rate is 0.2 percentage points higher.
Sales tax
- Ohio: 7.29% combined state and average local rate vs South Dakota: 6.11%.
- Ohio's combined rate is 1.18 percentage points higher.
Official Websites
Ohio official website · South Dakota official website
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More Size Comparisons
All Ohio size comparisons · All South Dakota 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.