The map above shows Ohio and Wisconsin side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Ohio vs Wisconsin Geography
Land area: Ohio has a land area of 40,859 square miles (105,824 km²), while Wisconsin has 54,168 square miles (140,294 km²). Wisconsin's land area is 1.3 times (33%) larger than Ohio's.
Total area: Ohio: 44,826 square miles (116,098 km²) vs Wisconsin: 65,497 square miles (169,636 km²), including inland and coastal water. Wisconsin's total area is 1.5 times (46%) larger than Ohio's.
Length: Ohio is 291 miles (468 km) long from north to south; Wisconsin is 368 miles (593 km). Wisconsin's north-south length is 1.3 times (26%) longer than Ohio's.
Width: Ohio spans 317 miles (510 km) east to west; Wisconsin spans 323 miles (521 km). Ohio and Wisconsin have about the same east-west width.
Highest point: Ohio's highest point is Campbell Hill at 1,547 feet (472 m); Wisconsin's is Timms Hill at 1,946 feet (593 m). Timms Hill is 399 feet higher than Campbell Hill.
Lowest point: Ohio's lowest point is Ohio River at 455 feet; Wisconsin's is Lake Michigan at 577 feet. Ohio's lowest point is 122 feet lower.
Ohio vs Wisconsin Population and History
Population: Ohio has a population of 11,883,304 (2024), while Wisconsin has 5,960,975 (2024). Ohio's population is 2.0 times (99%) larger than Wisconsin's.
Population density: Ohio: 290.8 people per square mile vs Wisconsin: 110.0. Ohio's population density is 2.6 times (164%) higher than Wisconsin's.
Biggest city: Ohio's biggest city is Columbus with 933,263 people; Wisconsin's is Milwaukee with 563,531. Columbus' population is 1.7 times (66%) larger than Milwaukee's.
Largest metro area: Ohio's largest metropolitan area is Cincinnati, OH-KY-IN metro area (2,302,815 people) vs Wisconsin's Minneapolis-St. Paul-Bloomington, MN-WI metro area (3,757,952). Minneapolis-St. Paul-Bloomington, MN-WI metro area's population is 1.6 times (63%) larger than Cincinnati, OH-KY-IN metro area's.
History: Ohio: Admitted to the Union on March 1, 1803, as the 17th state. Wisconsin: Admitted to the Union on May 29, 1848, as the 30th state. In its current form, Ohio is the older of the two by 45 years.
Ohio vs Wisconsin Economy
GDP: Ohio's GDP is $923.1 billion (2024) vs Wisconsin's $453.3 billion. Ohio's economic output is 2.0 times (104%) larger than Wisconsin's.
GDP per capita: Ohio: $77,684 per person vs Wisconsin: $76,044. Ohio and Wisconsin have about the same GDP per capita.
Average income: Ohio: $64,464 vs Wisconsin: $67,755 average income per person (per capita personal income). Wisconsin's average income is 1.1 times (5%) higher than Ohio's.
Ohio vs Wisconsin Counties
Number of counties: Ohio has 88 counties, while Wisconsin has 72. Ohio's county count is 1.2 times (22%) higher than Wisconsin's.
Biggest county by area: Ohio's largest county is Ashtabula County at 702 square miles; Wisconsin's is Marathon County at 1,545 square miles. Marathon County's land area is 2.2 times (120%) larger than Ashtabula County's.
Smallest county by area: Ohio: Lake County (229 sq mi) vs Wisconsin: Pepin County (232 sq mi). Lake County and Pepin County have about the same land area.
Most populous county: Ohio: Franklin County (1,356,303 people) vs Wisconsin: Milwaukee County (924,740 people). Franklin County's population is 1.5 times (47%) larger than Milwaukee County's.
Least populous county: Ohio: Vinton County (12,545 people) vs Wisconsin: Menominee County (4,286 people). Vinton County's population is 2.9 times (193%) larger than Menominee County's.
Richest county: Ohio: Delaware County ($96,573 per capita income) vs Wisconsin: Ozaukee County ($109,947). Ozaukee County's income is 1.1 times (14%) richer than Delaware County's.
Poorest county: Ohio: Noble County ($34,940 per capita income) vs Wisconsin: Menominee County ($43,696). Menominee County's income is 1.3 times (25%) richer than Noble County's.
Ohio vs Wisconsin Taxes
State income tax: Ohio has a top income tax rate of 2.75%, while Wisconsin has a top income tax rate of 7.65%. Wisconsin's top rate is 4.9 percentage points higher.
Property tax: Ohio: 1.22% effective rate vs Wisconsin: 1.25% of home value per year. Wisconsin's rate is 0.03 percentage points higher.
Sales tax: Ohio: 7.29% combined state and average local rate vs Wisconsin: 5.72%. Ohio's combined rate is 1.57 percentage points higher.
Official Websites
Ohio official website · Wisconsin official website
More Size Comparisons
All Ohio size comparisons · All Wisconsin 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.