The map above shows Oklahoma and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Oklahoma vs Ontario Geography
Land area: Oklahoma has a land area of 68,597 square miles (177,665 km²), while Ontario has 354,342 square miles (917,741 km²). Ontario's land area is 5.2 times (417%) larger than Oklahoma's.
Total area: Oklahoma: 69,899 square miles (181,038 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water. Ontario's total area is 5.9 times (495%) larger than Oklahoma's.
Length: Oklahoma is 533 miles (857 km) long from north to south; Ontario is 1,085 miles (1,747 km). Ontario's north-south length is 2.0 times (104%) longer than Oklahoma's.
Width: Oklahoma spans 490 miles (789 km) east to west; Ontario spans 1,013 miles (1,630 km). Ontario's east-west width is 2.1 times (107%) wider than Oklahoma's.
Highest point: Oklahoma's highest point is Black Mesa at 4,980 feet (1,518 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m). Black Mesa is 2,706 feet higher than Ishpatina Ridge.
Lowest point: Oklahoma's lowest point is Little River at 289 feet; Ontario's is Hudson Bay at 0 feet. Ontario's lowest point is 289 feet lower.
Oklahoma vs Ontario Population and History
Population: Oklahoma has a population of 4,095,393 (2024), while Ontario has 16,136,480 (2026). Ontario's population is 3.9 times (294%) larger than Oklahoma's.
Population density: Oklahoma: 59.7 people per square mile vs Ontario: 45.5. Oklahoma's population density is 1.3 times (31%) higher than Ontario's.
Biggest city: Oklahoma's biggest city is Oklahoma City with 712,919 people; Ontario's is Toronto with 2,794,356. Toronto's population is 3.9 times (292%) larger than Oklahoma City's.
Largest metro area: Oklahoma's largest metropolitan area is Oklahoma City, OK metro area (1,497,821 people) vs Ontario's Toronto CMA (6,202,225). Toronto CMA's population is 4.1 times (314%) larger than Oklahoma City, OK metro area's.
History: Oklahoma: Admitted to the Union on November 16, 1907, as the 46th 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 40 years.
Oklahoma vs Ontario Economy
GDP: Oklahoma's GDP is $263.7 billion (2024) vs Ontario's $873.9 billion. Ontario's economic output is 3.3 times (231%) larger than Oklahoma's.
GDP per capita: Oklahoma: $64,388 per person vs Ontario: $54,132. Oklahoma's GDP per capita is 1.2 times (19%) higher than Ontario's.
Official Websites
Oklahoma official website · Ontario official website
More Size Comparisons
All Oklahoma 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.