The map above shows Ontario and Western Australia side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Ontario vs Western Australia Geography
Land area: Ontario has a land area of 354,342 square miles (917,741 km²), while Western Australia has 975,685 square miles (2,527,013 km²). Western Australia's land area is 2.8 times (175%) larger than Ontario's.
Total area: Ontario: 415,598 square miles (1,076,395 km²) vs Western Australia: 975,685 square miles (2,527,013 km²), including inland and coastal water. Western Australia's total area is 2.3 times (135%) larger than Ontario's.
Length: Ontario is 1,085 miles (1,747 km) long from north to south; Western Australia is 1,590 miles (2,558 km). Western Australia's north-south length is 1.5 times (47%) longer than Ontario's.
Width: Ontario spans 1,013 miles (1,630 km) east to west; Western Australia spans 1,286 miles (2,069 km). Western Australia's east-west width is 1.3 times (27%) wider than Ontario's.
Highest point: Ontario's highest point is Ishpatina Ridge at 2,274 feet (693 m); Western Australia's is Mount Meharry at 4,098 feet (1,249 m). Mount Meharry is 1,824 feet higher than Ishpatina Ridge.
Lowest point: Ontario's lowest point is Hudson Bay at 0 feet; Western Australia's is Indian Ocean at 0 feet. Both lowest points are at or near sea level.
Ontario vs Western Australia Population and History
Population: Ontario has a population of 16,136,480 (2026), while Western Australia has 3,061,672 (2025). Ontario's population is 5.3 times (427%) larger than Western Australia's.
Population density: Ontario: 45.5 people per square mile vs Western Australia: 3.1. Ontario's population density is 14.7 times higher than Western Australia's.
Largest metro area: Ontario's largest metropolitan area is Toronto CMA (6,202,225 people) vs Western Australia's Greater Perth (2,452,765). Toronto CMA's population is 2.5 times (153%) larger than Greater Perth's.
History: Ontario: Joined Confederation on July 1, 1867, as one of the four founding provinces. Western Australia: Became an Australian state at Federation on January 1, 1901; founded as a colony in 1829. In its current form, Ontario is the older of the two by 34 years.
Ontario vs Western Australia Economy
GDP: Ontario's GDP is $873.9 billion (2024) vs Western Australia's $304.6 billion. Ontario's economic output is 2.9 times (187%) larger than Western Australia's.
GDP per capita: Ontario: $54,132 per person vs Western Australia: $99,488. Western Australia's GDP per capita is 1.8 times (84%) higher than Ontario's.
Official Websites
Ontario official website · Western Australia official website
More Size Comparisons
All Ontario size comparisons · All Western Australia 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.