The map above shows Alberta and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Alberta vs Ontario Geography
Land area: Alberta has a land area of 248,000 square miles (642,317 km²), while Ontario has 354,342 square miles (917,741 km²). Ontario's land area is 1.4 times (43%) larger than Alberta's.
Total area: Alberta: 255,541 square miles (661,848 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water. Ontario's total area is 1.6 times (63%) larger than Alberta's.
Length: Alberta is 810 miles (1,303 km) long from north to south; Ontario is 1,085 miles (1,747 km). Ontario's north-south length is 1.3 times (34%) longer than Alberta's.
Width: Alberta spans 544 miles (876 km) east to west; Ontario spans 1,013 miles (1,630 km). Ontario's east-west width is 1.9 times (86%) wider than Alberta's.
Highest point: Alberta's highest point is Mount Columbia at 12,293 feet (3,747 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m). Mount Columbia is 10,019 feet higher than Ishpatina Ridge.
Lowest point: Alberta's lowest point is Slave River at 499 feet; Ontario's is Hudson Bay at 0 feet. Ontario's lowest point is 499 feet lower.
Alberta vs Ontario Population and History
Population: Alberta has a population of 5,048,151 (2026), while Ontario has 16,136,480 (2026). Ontario's population is 3.2 times (220%) larger than Alberta's.
Population density: Alberta: 20.4 people per square mile vs Ontario: 45.5. Ontario's population density is 2.2 times (123%) higher than Alberta's.
Biggest city: Alberta's biggest city is Calgary with 1,306,784 people; Ontario's is Toronto with 2,794,356. Toronto's population is 2.1 times (114%) larger than Calgary's.
Largest metro area: Alberta's largest metropolitan area is Calgary CMA (1,481,806 people) vs Ontario's Toronto CMA (6,202,225). Toronto CMA's population is 4.2 times (319%) larger than Calgary CMA's.
History: Alberta: Joined Confederation on September 1, 1905. 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 38 years.
Alberta vs Ontario Economy
GDP: Alberta's GDP is $346.0 billion (2024) vs Ontario's $873.9 billion. Ontario's economic output is 2.5 times (153%) larger than Alberta's.
GDP per capita: Alberta: $70,487 per person vs Ontario: $54,132. Alberta's GDP per capita is 1.3 times (30%) higher than Ontario's.
Official Websites
Alberta official website · Ontario official website
More Size Comparisons
All Alberta 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.