The map above shows South Dakota and Wyoming side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
South Dakota vs Wyoming Geography
Land area: South Dakota has a land area of 75,808 square miles (196,342 km²), while Wyoming has 97,089 square miles (251,458 km²). Wyoming's land area is 1.3 times (28%) larger than South Dakota's.
Total area: South Dakota: 77,116 square miles (199,729 km²) vs Wyoming: 97,810 square miles (253,326 km²), including inland and coastal water. Wyoming's total area is 1.3 times (27%) larger than South Dakota's.
Length: South Dakota is 443 miles (712 km) long from north to south; Wyoming is 324 miles (522 km). South Dakota's north-south length is 1.4 times (37%) longer than Wyoming's.
Width: South Dakota spans 371 miles (597 km) east to west; Wyoming spans 410 miles (659 km). Wyoming's east-west width is 1.1 times (11%) wider than South Dakota's.
Highest point: South Dakota's highest point is Black Elk Peak at 7,198 feet (2,194 m); Wyoming's is Gannett Peak at 13,788 feet (4,203 m). Gannett Peak is 6,590 feet higher than Black Elk Peak.
Lowest point: South Dakota's lowest point is Big Stone Lake at 966 feet; Wyoming's is Belle Fourche River at 3,108 feet. South Dakota's lowest point is 2,142 feet lower.
South Dakota vs Wyoming Population and History
Population: South Dakota has a population of 924,669 (2024), while Wyoming has 587,618 (2024). South Dakota's population is 1.6 times (57%) larger than Wyoming's.
Population density: South Dakota: 12.2 people per square mile vs Wyoming: 6.1. South Dakota's population density is 2.0 times (100%) higher than Wyoming's.
Biggest city: South Dakota's biggest city is Sioux Falls with 209,289 people; Wyoming's is Cheyenne with 65,704. Sioux Falls' population is 3.2 times (219%) larger than Cheyenne's.
Largest metro area: South Dakota's largest metropolitan area is Sioux Falls, SD-MN metro area (308,266 people) vs Wyoming's Cheyenne, WY metro area (101,783). Sioux Falls, SD-MN metro area's population is 3.0 times (203%) larger than Cheyenne, WY metro area's.
History: South Dakota: Admitted to the Union on November 2, 1889, as the 40th state. Wyoming: Admitted to the Union on July 10, 1890, as the 44th state. In its current form, South Dakota is the older of the two by 1 years.
South Dakota vs Wyoming Economy
GDP: South Dakota's GDP is $76.8 billion (2024) vs Wyoming's $51.5 billion. South Dakota's economic output is 1.5 times (49%) larger than Wyoming's.
GDP per capita: South Dakota: $83,052 per person vs Wyoming: $87,639. Wyoming's GDP per capita is 1.1 times (6%) higher than South Dakota's.
Average income: South Dakota: $75,699 vs Wyoming: $86,477 average income per person (per capita personal income). Wyoming's average income is 1.1 times (14%) higher than South Dakota's.
South Dakota vs Wyoming Counties
Number of counties: South Dakota has 66 counties, while Wyoming has 23. South Dakota's county count is 2.9 times (187%) higher than Wyoming's.
Biggest county by area: South Dakota's largest county is Meade County at 3,471 square miles; Wyoming's is Sweetwater County at 10,427 square miles. Sweetwater County's land area is 3.0 times (200%) larger than Meade County's.
Smallest county by area: South Dakota: Clay County (412 sq mi) vs Wyoming: Hot Springs County (2,004 sq mi). Hot Springs County's land area is 4.9 times (387%) larger than Clay County's.
Most populous county: South Dakota: Minnehaha County (208,639 people) vs Wyoming: Laramie County (101,783 people). Minnehaha County's population is 2.0 times (105%) larger than Laramie County's.
Least populous county: South Dakota: Jones County (874 people) vs Wyoming: Niobrara County (2,301 people). Niobrara County's population is 2.6 times (163%) larger than Jones County's.
Richest county: South Dakota: Union County ($146,712 per capita income) vs Wyoming: Teton County ($532,903). Teton County's income is 3.6 times (263%) richer than Union County's.
Poorest county: South Dakota: Ziebach County ($32,778 per capita income) vs Wyoming: Uinta County ($50,370). Uinta County's income is 1.5 times (54%) richer than Ziebach County's.
South Dakota vs Wyoming Taxes
State income tax: South Dakota has no state income tax, while Wyoming has no state income tax.
Property tax: South Dakota: 1.02% effective rate vs Wyoming: 0.57% of home value per year. South Dakota's rate is 0.45 percentage points higher.
Sales tax: South Dakota: 6.11% combined state and average local rate vs Wyoming: 5.39%. South Dakota's combined rate is 0.72 percentage points higher.
Official Websites
South Dakota official website · Wyoming official website
More Size Comparisons
All South Dakota size comparisons · All Wyoming 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.