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
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.