The map above shows Indiana and South Dakota side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Indiana vs South Dakota Geography
Land area: Indiana has a land area of 35,825 square miles (92,787 km²), while South Dakota has 75,808 square miles (196,342 km²). South Dakota's land area is 2.1 times (112%) larger than Indiana's.
Total area: Indiana: 36,421 square miles (94,331 km²) vs South Dakota: 77,116 square miles (199,729 km²), including inland and coastal water. South Dakota's total area is 2.1 times (112%) larger than Indiana's.
Length: Indiana is 276 miles (444 km) long from north to south; South Dakota is 443 miles (712 km). South Dakota's north-south length is 1.6 times (61%) longer than Indiana's.
Width: Indiana spans 193 miles (310 km) east to west; South Dakota spans 371 miles (597 km). South Dakota's east-west width is 1.9 times (92%) wider than Indiana's.
Highest point: Indiana's highest point is Hoosier Hill at 1,255 feet (383 m); South Dakota's is Black Elk Peak at 7,198 feet (2,194 m). Black Elk Peak is 5,943 feet higher than Hoosier Hill.
Lowest point: Indiana's lowest point is Ohio River at 330 feet; South Dakota's is Big Stone Lake at 966 feet. Indiana's lowest point is 636 feet lower.
Indiana vs South Dakota Population and History
Population: Indiana has a population of 6,924,275 (2024), while South Dakota has 924,669 (2024). Indiana's population is 7.5 times (649%) larger than South Dakota's.
Population density: Indiana: 193.3 people per square mile vs South Dakota: 12.2. Indiana's population density is 15.8 times higher than South Dakota's.
Biggest city: Indiana's biggest city is Indianapolis with 891,484 people; South Dakota's is Sioux Falls with 209,289. Indianapolis' population is 4.3 times (326%) larger than Sioux Falls'.
Largest metro area: Indiana's largest metropolitan area is Chicago-Naperville-Elgin, IL-IN metro area (9,408,576 people) vs South Dakota's Sioux Falls, SD-MN metro area (308,266). Chicago-Naperville-Elgin, IL-IN metro area's population is 30.5 times larger than Sioux Falls, SD-MN metro area's.
History: Indiana: Admitted to the Union on December 11, 1816, as the 19th state. South Dakota: Admitted to the Union on November 2, 1889, as the 40th state. In its current form, Indiana is the older of the two by 73 years.
Indiana vs South Dakota Economy
GDP: Indiana's GDP is $519.5 billion (2024) vs South Dakota's $76.8 billion. Indiana's economic output is 6.8 times (576%) larger than South Dakota's.
GDP per capita: Indiana: $75,028 per person vs South Dakota: $83,052. South Dakota's GDP per capita is 1.1 times (11%) higher than Indiana's.
Average income: Indiana: $64,077 vs South Dakota: $75,699 average income per person (per capita personal income). South Dakota's average income is 1.2 times (18%) higher than Indiana's.
Indiana vs South Dakota Counties
Number of counties: Indiana has 92 counties, while South Dakota has 66. Indiana's county count is 1.4 times (39%) higher than South Dakota's.
Biggest county by area: Indiana's largest county is Allen County at 657 square miles; South Dakota's is Meade County at 3,471 square miles. Meade County's land area is 5.3 times (428%) larger than Allen County's.
Smallest county by area: Indiana: Ohio County (86 sq mi) vs South Dakota: Clay County (412 sq mi). Clay County's land area is 4.8 times (378%) larger than Ohio County's.
Most populous county: Indiana: Marion County (981,628 people) vs South Dakota: Minnehaha County (208,639 people). Marion County's population is 4.7 times (370%) larger than Minnehaha County's.
Least populous county: Indiana: Ohio County (5,996 people) vs South Dakota: Jones County (874 people). Ohio County's population is 6.9 times (586%) larger than Jones County's.
Richest county: Indiana: Hamilton County ($104,283 per capita income) vs South Dakota: Union County ($146,712). Union County's income is 1.4 times (41%) richer than Hamilton County's.
Poorest county: Indiana: Miami County ($44,940 per capita income) vs South Dakota: Ziebach County ($32,778). Miami County's income is 1.4 times (37%) richer than Ziebach County's.
Indiana vs South Dakota Taxes
State income tax: Indiana has a top income tax rate of 2.95%, while South Dakota has no state income tax. Indiana's top rate is 2.95 percentage points higher.
Property tax: Indiana: 0.74% effective rate vs South Dakota: 1.02% of home value per year. South Dakota's rate is 0.28 percentage points higher.
Sales tax: Indiana: 7% combined state and average local rate vs South Dakota: 6.11%. Indiana's combined rate is 0.89 percentage points higher.
Official Websites
Indiana official website · South Dakota official website
More Size Comparisons
All Indiana 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.