The map above shows Indiana and Ohio side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Indiana vs Ohio Geography
Land area: Indiana has a land area of 35,825 square miles (92,787 km²), while Ohio has 40,859 square miles (105,824 km²). Ohio's land area is 1.1 times (14%) larger than Indiana's.
Total area: Indiana: 36,421 square miles (94,331 km²) vs Ohio: 44,826 square miles (116,098 km²), including inland and coastal water. Ohio's total area is 1.2 times (23%) larger than Indiana's.
Length: Indiana is 276 miles (444 km) long from north to south; Ohio is 291 miles (468 km). Ohio's north-south length is 1.1 times (5%) longer than Indiana's.
Width: Indiana spans 193 miles (310 km) east to west; Ohio spans 317 miles (510 km). Ohio's east-west width is 1.6 times (64%) wider than Indiana's.
Highest point: Indiana's highest point is Hoosier Hill at 1,255 feet (383 m); Ohio's is Campbell Hill at 1,547 feet (472 m). Campbell Hill is 292 feet higher than Hoosier Hill.
Lowest point: Indiana's lowest point is Ohio River at 330 feet; Ohio's is Ohio River at 455 feet. Indiana's lowest point is 125 feet lower.
Indiana vs Ohio Population and History
Population: Indiana has a population of 6,924,275 (2024), while Ohio has 11,883,304 (2024). Ohio's population is 1.7 times (72%) larger than Indiana's.
Population density: Indiana: 193.3 people per square mile vs Ohio: 290.8. Ohio's population density is 1.5 times (50%) higher than Indiana's.
Biggest city: Indiana's biggest city is Indianapolis with 891,484 people; Ohio's is Columbus with 933,263. Indianapolis and Columbus have about the same population.
Largest metro area: Indiana's largest metropolitan area is Chicago-Naperville-Elgin, IL-IN metro area (9,408,576 people) vs Ohio's Cincinnati, OH-KY-IN metro area (2,302,815). Chicago-Naperville-Elgin, IL-IN metro area's population is 4.1 times (309%) larger than Cincinnati, OH-KY-IN metro area's.
History: Indiana: Admitted to the Union on December 11, 1816, as the 19th state. Ohio: Admitted to the Union on March 1, 1803, as the 17th state. In its current form, Ohio is the older of the two by 13 years.
Indiana vs Ohio Economy
GDP: Indiana's GDP is $519.5 billion (2024) vs Ohio's $923.1 billion. Ohio's economic output is 1.8 times (78%) larger than Indiana's.
GDP per capita: Indiana: $75,028 per person vs Ohio: $77,684. Indiana and Ohio have about the same GDP per capita.
Average income: Indiana: $64,077 vs Ohio: $64,464 average income per person (per capita personal income). Indiana and Ohio have about the same average income.
Indiana vs Ohio Counties
Number of counties: Indiana has 92 counties, while Ohio has 88. Indiana and Ohio have about the same county count.
Biggest county by area: Indiana's largest county is Allen County at 657 square miles; Ohio's is Ashtabula County at 702 square miles. Ashtabula County's land area is 1.1 times (7%) larger than Allen County's.
Smallest county by area: Indiana: Ohio County (86 sq mi) vs Ohio: Lake County (229 sq mi). Lake County's land area is 2.7 times (166%) larger than Ohio County's.
Most populous county: Indiana: Marion County (981,628 people) vs Ohio: Franklin County (1,356,303 people). Franklin County's population is 1.4 times (38%) larger than Marion County's.
Least populous county: Indiana: Ohio County (5,996 people) vs Ohio: Vinton County (12,545 people). Vinton County's population is 2.1 times (109%) larger than Ohio County's.
Richest county: Indiana: Hamilton County ($104,283 per capita income) vs Ohio: Delaware County ($96,573). Hamilton County's income is 1.1 times (8%) richer than Delaware County's.
Poorest county: Indiana: Miami County ($44,940 per capita income) vs Ohio: Noble County ($34,940). Miami County's income is 1.3 times (29%) richer than Noble County's.
Indiana vs Ohio Taxes
State income tax: Indiana has a top income tax rate of 2.95%, while Ohio has a top income tax rate of 2.75%. Indiana's top rate is 0.2 percentage points higher.
Property tax: Indiana: 0.74% effective rate vs Ohio: 1.22% of home value per year. Ohio's rate is 0.48 percentage points higher.
Sales tax: Indiana: 7% combined state and average local rate vs Ohio: 7.29%. Ohio's combined rate is 0.29 percentage points higher.
Official Websites
Indiana official website · Ohio official website
More Size Comparisons
All Indiana size comparisons · All Ohio 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.