The map above shows Montana and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Montana vs Ontario Geography
Land area
- Montana has a land area of 145,550 square miles (376,973 km²), while Ontario has 354,342 square miles (917,741 km²).
- Ontario's land area is 2.4 times (143%) larger than Montana's.
Total area
- Montana: 147,043 square miles (380,840 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water.
- Ontario's total area is 2.8 times (183%) larger than Montana's.
Length
- Montana is 319 miles (514 km) long from north to south; Ontario is 1,085 miles (1,747 km).
- Ontario's north-south length is 3.4 times (240%) longer than Montana's.
Width
- Montana spans 607 miles (976 km) east to west; Ontario spans 1,013 miles (1,630 km).
- Ontario's east-west width is 1.7 times (67%) wider than Montana's.
Highest point
- Montana's highest point is Granite Peak at 12,767 feet (3,891 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m).
- Granite Peak is 10,493 feet higher than Ishpatina Ridge.
Lowest point
- Montana's lowest point is Kootenai River at 1,805 feet; Ontario's is Hudson Bay at 0 feet.
- Ontario's lowest point is 1,805 feet lower.
Montana vs Ontario Population and History
Population
- Montana has a population of 1,137,233 (2024), while Ontario has 16,136,480 (2026).
- Ontario's population is 14.2 times larger than Montana's.
Population density
- Montana: 7.8 people per square mile vs Ontario: 45.5.
- Ontario's population density is 5.8 times (483%) higher than Montana's.
Biggest city
- Montana's biggest city is Billings with 121,483 people; Ontario's is Toronto with 2,794,356.
- Toronto's population is 23.0 times larger than Billings'.
Largest metro area
- Montana's largest metropolitan area is Billings, MT metro area (192,531 people) vs Ontario's Toronto CMA (6,202,225).
- Toronto CMA's population is 32.2 times larger than Billings, MT metro area's.
History
- Montana: Admitted to the Union on November 8, 1889, as the 41st state.
- Ontario: Joined Confederation on July 1, 1867, as one of the four founding provinces.
- In its current form, Ontario is the older of the two by 22 years.
Montana vs Ontario Economy
GDP
- Montana's GDP is $78.4 billion (2024) vs Ontario's $873.9 billion.
- Ontario's economic output is 11.1 times larger than Montana's.
GDP per capita
- Montana: $68,975 per person vs Ontario: $54,132.
- Montana's GDP per capita is 1.3 times (27%) higher than Ontario's.
Official Websites
Montana official website · Ontario official website
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More Size Comparisons
All Montana 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.