The map above shows Washington and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Washington vs Ontario Geography
Land area: Washington has a land area of 66,455 square miles (172,119 km²), while Ontario has 354,342 square miles (917,741 km²). Ontario's land area is 5.3 times (433%) larger than Washington's.
Total area: Washington: 71,301 square miles (184,668 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water. Ontario's total area is 5.8 times (483%) larger than Washington's.
Length: Washington is 238 miles (383 km) long from north to south; Ontario is 1,085 miles (1,747 km). Ontario's north-south length is 4.6 times (356%) longer than Washington's.
Width: Washington spans 399 miles (641 km) east to west; Ontario spans 1,013 miles (1,630 km). Ontario's east-west width is 2.5 times (154%) wider than Washington's.
Highest point: Washington's highest point is Mount Rainier at 14,409 feet (4,392 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m). Mount Rainier is 12,135 feet higher than Ishpatina Ridge.
Lowest point: Washington's lowest point is Pacific Ocean at 0 feet; Ontario's is Hudson Bay at 0 feet. Both lowest points are at or near sea level.
Washington vs Ontario Population and History
Population: Washington has a population of 7,958,180 (2024), while Ontario has 16,136,480 (2026). Ontario's population is 2.0 times (103%) larger than Washington's.
Population density: Washington: 119.8 people per square mile vs Ontario: 45.5. Washington's population density is 2.6 times (163%) higher than Ontario's.
Biggest city: Washington's biggest city is Seattle with 780,995 people; Ontario's is Toronto with 2,794,356. Toronto's population is 3.6 times (258%) larger than Seattle's.
Largest metro area: Washington's largest metropolitan area is Seattle-Tacoma-Bellevue, WA metro area (4,145,494 people) vs Ontario's Toronto CMA (6,202,225). Toronto CMA's population is 1.5 times (50%) larger than Seattle-Tacoma-Bellevue, WA metro area's.
History: Washington: Admitted to the Union on November 11, 1889, as the 42nd 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.
Washington vs Ontario Economy
GDP: Washington's GDP is $856.0 billion (2024) vs Ontario's $873.9 billion. Washington and Ontario have about the same economic output.
GDP per capita: Washington: $107,564 per person vs Ontario: $54,132. Washington's GDP per capita is 2.0 times (99%) higher than Ontario's.
Official Websites
Washington official website · Ontario official website
More Size Comparisons
All Washington 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.