The map above shows Arizona and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Arizona vs Ontario Geography
Land area: Arizona has a land area of 113,655 square miles (294,366 km²), while Ontario has 354,342 square miles (917,741 km²). Ontario's land area is 3.1 times (212%) larger than Arizona's.
Total area: Arizona: 113,985 square miles (295,220 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water. Ontario's total area is 3.6 times (265%) larger than Arizona's.
Length: Arizona is 429 miles (690 km) long from north to south; Ontario is 1,085 miles (1,747 km). Ontario's north-south length is 2.5 times (153%) longer than Arizona's.
Width: Arizona spans 452 miles (727 km) east to west; Ontario spans 1,013 miles (1,630 km). Ontario's east-west width is 2.2 times (124%) wider than Arizona's.
Highest point: Arizona's highest point is Humphreys Peak at 12,620 feet (3,847 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m). Humphreys Peak is 10,346 feet higher than Ishpatina Ridge.
Lowest point: Arizona's lowest point is Colorado River at 71 feet; Ontario's is Hudson Bay at 0 feet. Ontario's lowest point is 71 feet lower.
Arizona vs Ontario Population and History
Population: Arizona has a population of 7,582,384 (2024), while Ontario has 16,136,480 (2026). Ontario's population is 2.1 times (113%) larger than Arizona's.
Population density: Arizona: 66.7 people per square mile vs Ontario: 45.5. Arizona's population density is 1.5 times (47%) higher than Ontario's.
Biggest city: Arizona's biggest city is Phoenix with 1,673,164 people; Ontario's is Toronto with 2,794,356. Toronto's population is 1.7 times (67%) larger than Phoenix's.
Largest metro area: Arizona's largest metropolitan area is Phoenix-Mesa-Chandler, AZ metro area (5,186,958 people) vs Ontario's Toronto CMA (6,202,225). Toronto CMA's population is 1.2 times (20%) larger than Phoenix-Mesa-Chandler, AZ metro area's.
History: Arizona: Admitted to the Union on February 14, 1912, as the 48th 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 45 years.
Arizona vs Ontario Economy
GDP: Arizona's GDP is $570.1 billion (2024) vs Ontario's $873.9 billion. Ontario's economic output is 1.5 times (53%) larger than Arizona's.
GDP per capita: Arizona: $75,186 per person vs Ontario: $54,132. Arizona's GDP per capita is 1.4 times (39%) higher than Ontario's.
Official Websites
Arizona official website · Ontario official website
More Size Comparisons
All Arizona 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.