The map above shows Oklahoma and South Dakota side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Oklahoma vs South Dakota Geography
Land area
- Oklahoma has a land area of 68,597 square miles (177,665 km²), while South Dakota has 75,808 square miles (196,342 km²).
- South Dakota's land area is 1.1 times (11%) larger than Oklahoma's.
Total area
- Oklahoma: 69,899 square miles (181,038 km²) vs South Dakota: 77,116 square miles (199,729 km²), including inland and coastal water.
- South Dakota's total area is 1.1 times (10%) larger than Oklahoma's.
Length
- Oklahoma is 533 miles (857 km) long from north to south; South Dakota is 443 miles (712 km).
- Oklahoma's north-south length is 1.2 times (20%) longer than South Dakota's.
Width
- Oklahoma spans 490 miles (789 km) east to west; South Dakota spans 371 miles (597 km).
- Oklahoma's east-west width is 1.3 times (32%) wider than South Dakota's.
Highest point
- Oklahoma's highest point is Black Mesa at 4,980 feet (1,518 m); South Dakota's is Black Elk Peak at 7,198 feet (2,194 m).
- Black Elk Peak is 2,218 feet higher than Black Mesa.
Lowest point
- Oklahoma's lowest point is Little River at 289 feet; South Dakota's is Big Stone Lake at 966 feet.
- Oklahoma's lowest point is 677 feet lower.
Oklahoma vs South Dakota Population and History
Population
- Oklahoma has a population of 4,095,393 (2024), while South Dakota has 924,669 (2024).
- Oklahoma's population is 4.4 times (343%) larger than South Dakota's.
Population density
- Oklahoma: 59.7 people per square mile vs South Dakota: 12.2.
- Oklahoma's population density is 4.9 times (389%) higher than South Dakota's.
Biggest city
- Oklahoma's biggest city is Oklahoma City with 712,919 people; South Dakota's is Sioux Falls with 209,289.
- Oklahoma City's population is 3.4 times (241%) larger than Sioux Falls'.
Largest metro area
- Oklahoma's largest metropolitan area is Oklahoma City, OK metro area (1,497,821 people) vs South Dakota's Sioux Falls, SD-MN metro area (308,266).
- Oklahoma City, OK metro area's population is 4.9 times (386%) larger than Sioux Falls, SD-MN metro area's.
History
- Oklahoma: Admitted to the Union on November 16, 1907, as the 46th state.
- South Dakota: Admitted to the Union on November 2, 1889, as the 40th state.
- In its current form, South Dakota is the older of the two by 18 years.
Oklahoma vs South Dakota Economy
GDP
- Oklahoma's GDP is $263.7 billion (2024) vs South Dakota's $76.8 billion.
- Oklahoma's economic output is 3.4 times (243%) larger than South Dakota's.
GDP per capita
- Oklahoma: $64,388 per person vs South Dakota: $83,052.
- South Dakota's GDP per capita is 1.3 times (29%) higher than Oklahoma's.
Average income
- Oklahoma: $63,708 vs South Dakota: $75,699 average income per person (per capita personal income).
- South Dakota's average income is 1.2 times (19%) higher than Oklahoma's.
Oklahoma vs South Dakota Counties
Number of counties
- Oklahoma has 77 counties, while South Dakota has 66.
- Oklahoma's county count is 1.2 times (17%) higher than South Dakota's.
Biggest county by area
- Oklahoma's largest county is Osage County at 2,247 square miles; South Dakota's is Meade County at 3,471 square miles.
- Meade County's land area is 1.5 times (54%) larger than Osage County's.
Smallest county by area
- Oklahoma: Marshall County (372 sq mi) vs South Dakota: Clay County (412 sq mi).
- Clay County's land area is 1.1 times (11%) larger than Marshall County's.
Most populous county
- Oklahoma: Oklahoma County (816,490 people) vs South Dakota: Minnehaha County (208,639 people).
- Oklahoma County's population is 3.9 times (291%) larger than Minnehaha County's.
Least populous county
- Oklahoma: Cimarron County (2,133 people) vs South Dakota: Jones County (874 people).
- Cimarron County's population is 2.4 times (144%) larger than Jones County's.
Richest county
- Oklahoma: Washington County ($126,749 per capita income) vs South Dakota: Union County ($146,712).
- Union County's income is 1.2 times (16%) richer than Washington County's.
Poorest county
- Oklahoma: Atoka County ($38,709 per capita income) vs South Dakota: Ziebach County ($32,778).
- Atoka County's income is 1.2 times (18%) richer than Ziebach County's.
Oklahoma vs South Dakota Taxes
State income tax
- Oklahoma has a top income tax rate of 4.5%, while South Dakota has no state income tax.
- Oklahoma's top rate is 4.5 percentage points higher.
Property tax
- Oklahoma: 0.75% effective rate vs South Dakota: 1.02% of home value per year.
- South Dakota's rate is 0.27 percentage points higher.
Sales tax
- Oklahoma: 9.06% combined state and average local rate vs South Dakota: 6.11%.
- Oklahoma's combined rate is 2.95 percentage points higher.
Official Websites
Oklahoma official website · South Dakota official website
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More Size Comparisons
All Oklahoma 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.