The map above shows Idaho and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Idaho vs Ontario Geography
Land area
- Idaho has a land area of 82,645 square miles (214,051 km²), while Ontario has 354,342 square miles (917,741 km²).
- Ontario's land area is 4.3 times (329%) larger than Idaho's.
Total area
- Idaho: 83,569 square miles (216,441 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water.
- Ontario's total area is 5.0 times (397%) larger than Idaho's.
Length
- Idaho is 483 miles (778 km) long from north to south; Ontario is 1,085 miles (1,747 km).
- Ontario's north-south length is 2.2 times (125%) longer than Idaho's.
Width
- Idaho spans 352 miles (566 km) east to west; Ontario spans 1,013 miles (1,630 km).
- Ontario's east-west width is 2.9 times (188%) wider than Idaho's.
Highest point
- Idaho's highest point is Borah Peak at 12,631 feet (3,850 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m).
- Borah Peak is 10,357 feet higher than Ishpatina Ridge.
Lowest point
- Idaho's lowest point is Snake River at 718 feet; Ontario's is Hudson Bay at 0 feet.
- Ontario's lowest point is 718 feet lower.
Idaho vs Ontario Population and History
Population
- Idaho has a population of 2,001,619 (2024), while Ontario has 16,136,480 (2026).
- Ontario's population is 8.1 times (706%) larger than Idaho's.
Population density
- Idaho: 24.2 people per square mile vs Ontario: 45.5.
- Ontario's population density is 1.9 times (88%) higher than Idaho's.
Biggest city
- Idaho's biggest city is Boise with 237,963 people; Ontario's is Toronto with 2,794,356.
- Toronto's population is 11.7 times larger than Boise's.
Largest metro area
- Idaho's largest metropolitan area is Boise City, ID metro area (845,877 people) vs Ontario's Toronto CMA (6,202,225).
- Toronto CMA's population is 7.3 times (633%) larger than Boise City, ID metro area's.
History
- Idaho: Admitted to the Union on July 3, 1890, as the 43rd 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 23 years.
Idaho vs Ontario Economy
GDP
- Idaho's GDP is $129.0 billion (2024) vs Ontario's $873.9 billion.
- Ontario's economic output is 6.8 times (577%) larger than Idaho's.
GDP per capita
- Idaho: $64,457 per person vs Ontario: $54,132.
- Idaho's GDP per capita is 1.2 times (19%) higher than Ontario's.
Official Websites
Idaho official website · Ontario official website
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More Size Comparisons
All Idaho 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.