The map above shows Japan and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Japan vs Ontario Geography
Land area: Japan has a land area of 140,752 square miles (364,546 km²), while Ontario has 354,342 square miles (917,741 km²). Ontario's land area is 2.5 times (152%) larger than Japan's.
Total area: Japan: 145,937 square miles (377,975 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water. Ontario's total area is 2.8 times (185%) larger than Japan's.
Length: Japan is 1,557 miles (2,505 km) long from north to south; Ontario is 1,085 miles (1,747 km). Japan's north-south length is 1.4 times (44%) longer than Ontario's.
Width: Japan spans 1,568 miles (2,524 km) east to west; Ontario spans 1,013 miles (1,630 km). Japan's east-west width is 1.5 times (55%) wider than Ontario's.
Highest point: Japan's highest point is Mount Fuji at 12,388 feet (3,776 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m). Mount Fuji is 10,114 feet higher than Ishpatina Ridge.
Lowest point: Japan's lowest point is Hachirogata at -13 feet; Ontario's is Hudson Bay at 0 feet. Japan's lowest point is 13 feet lower.
Japan vs Ontario Population and History
Population: Japan has a population of 122,680,000 (2026), while Ontario has 16,136,480 (2026). Japan's population is 7.6 times (660%) larger than Ontario's.
Population density: Japan: 871.6 people per square mile vs Ontario: 45.5. Japan's population density is 19.2 times higher than Ontario's.
Biggest city: Japan's biggest city is Tokyo with 13,515,271 people; Ontario's is Toronto with 2,794,356. Tokyo's population is 4.8 times (384%) larger than Toronto's.
Largest metro area: Japan's largest metropolitan area is Tokyo (33,412,512 people) vs Ontario's Toronto CMA (6,202,225). Tokyo's population is 5.4 times (439%) larger than Toronto CMA's.
History: Japan: An independent state for over two millennia; the current constitution dates from 1947. Ontario: Joined Confederation on July 1, 1867, as one of the four founding provinces. In its current form, Japan is the older of the two by 1,207 years.
Japan vs Ontario Economy
GDP: Japan's GDP is $4,435.2 billion (2025) vs Ontario's $873.9 billion. Japan's economic output is 5.1 times (408%) larger than Ontario's.
GDP per capita: Japan: $35,951 per person vs Ontario: $54,132. Ontario's GDP per capita is 1.5 times (51%) higher than Japan's.
Official Websites
Japan official website · Ontario official website
More Size Comparisons
All Japan 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.