The map above shows United States and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
United States vs Ontario Geography
Land area: United States has a land area of 3,533,467 square miles (9,151,637 km²), while Ontario has 354,342 square miles (917,741 km²). United States' land area is 10.0 times (897%) larger than Ontario's.
Total area: United States: 3,802,784 square miles (9,849,165 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water. United States' total area is 9.2 times (815%) larger than Ontario's.
Length: United States is 3,628 miles (5,839 km) long from north to south; Ontario is 1,085 miles (1,747 km). United States' north-south length is 3.3 times (234%) longer than Ontario's.
Width: United States spans 4,824 miles (7,763 km) east to west; Ontario spans 1,013 miles (1,630 km). United States' east-west width is 4.8 times (376%) wider than Ontario's.
Highest point: United States's highest point is Denali at 20,308 feet (6,190 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m). Denali is 18,034 feet higher than Ishpatina Ridge.
Lowest point: United States's lowest point is Death Valley at -279 feet; Ontario's is Hudson Bay at 0 feet. United States's lowest point is 279 feet lower.
United States vs Ontario Population and History
Population: United States has a population of 340,110,988 (2024), while Ontario has 16,136,480 (2026). United States' population is 21.1 times larger than Ontario's.
Population density: United States: 96.3 people per square mile vs Ontario: 45.5. United States' population density is 2.1 times (112%) higher than Ontario's.
Biggest city: United States's biggest city is New York with 8,478,072 people; Ontario's is Toronto with 2,794,356. New York's population is 3.0 times (203%) larger than Toronto's.
Largest metro area: United States's largest metropolitan area is New York-Newark-Jersey City, NY-NJ metro area (19,940,274 people) vs Ontario's Toronto CMA (6,202,225). New York-Newark-Jersey City, NY-NJ metro area's population is 3.2 times (222%) larger than Toronto CMA's.
History: United States: Declared independence on July 4, 1776. Ontario: Joined Confederation on July 1, 1867, as one of the four founding provinces. In its current form, United States is the older of the two by 91 years.
United States vs Ontario Economy
GDP: United States's GDP is $30,769.7 billion (2025) vs Ontario's $873.9 billion. United States' economic output is 35.2 times larger than Ontario's.
GDP per capita: United States: $89,599 per person vs Ontario: $54,132. United States' GDP per capita is 1.7 times (66%) higher than Ontario's.
Official Websites
United States official website · Ontario official website
More Size Comparisons
All United States 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.