The map above shows Ohio and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Ohio vs Ontario Geography
Land area
- Ohio has a land area of 40,859 square miles (105,824 km²), while Ontario has 354,342 square miles (917,741 km²).
- Ontario's land area is 8.7 times (767%) larger than Ohio's.
Total area
- Ohio: 44,826 square miles (116,098 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water.
- Ontario's total area is 9.3 times (827%) larger than Ohio's.
Length
- Ohio is 291 miles (468 km) long from north to south; Ontario is 1,085 miles (1,747 km).
- Ontario's north-south length is 3.7 times (273%) longer than Ohio's.
Width
- Ohio spans 317 miles (510 km) east to west; Ontario spans 1,013 miles (1,630 km).
- Ontario's east-west width is 3.2 times (220%) wider than Ohio's.
Highest point
- Ohio's highest point is Campbell Hill at 1,547 feet (472 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m).
- Ishpatina Ridge is 727 feet higher than Campbell Hill.
Lowest point
- Ohio's lowest point is Ohio River at 455 feet; Ontario's is Hudson Bay at 0 feet.
- Ontario's lowest point is 455 feet lower.
Ohio vs Ontario Population and History
Population
- Ohio has a population of 11,883,304 (2024), while Ontario has 16,136,480 (2026).
- Ontario's population is 1.4 times (36%) larger than Ohio's.
Population density
- Ohio: 290.8 people per square mile vs Ontario: 45.5.
- Ohio's population density is 6.4 times (539%) higher than Ontario's.
Biggest city
- Ohio's biggest city is Columbus with 933,263 people; Ontario's is Toronto with 2,794,356.
- Toronto's population is 3.0 times (199%) larger than Columbus'.
Largest metro area
- Ohio's largest metropolitan area is Cincinnati, OH-KY-IN metro area (2,302,815 people) vs Ontario's Toronto CMA (6,202,225).
- Toronto CMA's population is 2.7 times (169%) larger than Cincinnati, OH-KY-IN metro area's.
History
- Ohio: Admitted to the Union on March 1, 1803, as the 17th state.
- Ontario: Joined Confederation on July 1, 1867, as one of the four founding provinces.
- In its current form, Ohio is the older of the two by 64 years.
Ohio vs Ontario Economy
GDP
- Ohio's GDP is $923.1 billion (2024) vs Ontario's $873.9 billion.
- Ohio's economic output is 1.1 times (6%) larger than Ontario's.
GDP per capita
- Ohio: $77,684 per person vs Ontario: $54,132.
- Ohio's GDP per capita is 1.4 times (44%) higher than Ontario's.
Official Websites
Ohio official website · Ontario official website
Download the Ohio vs Ontario Size Comparison Map for free
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More Size Comparisons
All Ohio size comparisons · All Ontario 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.