The map above shows Pennsylvania and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Pennsylvania vs Ontario Geography
Land area: Pennsylvania has a land area of 44,742 square miles (115,882 km²), while Ontario has 354,342 square miles (917,741 km²). Ontario's land area is 7.9 times (692%) larger than Pennsylvania's.
Total area: Pennsylvania: 46,054 square miles (119,279 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water. Ontario's total area is 9.0 times (802%) larger than Pennsylvania's.
Length: Pennsylvania is 284 miles (458 km) long from north to south; Ontario is 1,085 miles (1,747 km). Ontario's north-south length is 3.8 times (282%) longer than Pennsylvania's.
Width: Pennsylvania spans 307 miles (495 km) east to west; Ontario spans 1,013 miles (1,630 km). Ontario's east-west width is 3.3 times (230%) wider than Pennsylvania's.
Highest point: Pennsylvania's highest point is Mount Davis at 3,210 feet (978 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m). Mount Davis is 936 feet higher than Ishpatina Ridge.
Lowest point: Pennsylvania's lowest point is Delaware River at 0 feet; Ontario's is Hudson Bay at 0 feet. Both lowest points are at or near sea level.
Pennsylvania vs Ontario Population and History
Population: Pennsylvania has a population of 13,078,751 (2024), while Ontario has 16,136,480 (2026). Ontario's population is 1.2 times (23%) larger than Pennsylvania's.
Population density: Pennsylvania: 292.3 people per square mile vs Ontario: 45.5. Pennsylvania's population density is 6.4 times (542%) higher than Ontario's.
Biggest city: Pennsylvania's biggest city is Philadelphia with 1,573,916 people; Ontario's is Toronto with 2,794,356. Toronto's population is 1.8 times (78%) larger than Philadelphia's.
Largest metro area: Pennsylvania's largest metropolitan area is Philadelphia-Camden-Wilmington, PA-NJ-DE-MD metro area (6,330,422 people) vs Ontario's Toronto CMA (6,202,225). Philadelphia-Camden-Wilmington, PA-NJ-DE-MD metro area and Toronto CMA have about the same population.
History: Pennsylvania: Admitted to the Union on December 12, 1787, as the 2nd state. Ontario: Joined Confederation on July 1, 1867, as one of the four founding provinces. In its current form, Pennsylvania is the older of the two by 80 years.
Pennsylvania vs Ontario Economy
GDP: Pennsylvania's GDP is $1,007.9 billion (2024) vs Ontario's $873.9 billion. Pennsylvania's economic output is 1.2 times (15%) larger than Ontario's.
GDP per capita: Pennsylvania: $77,062 per person vs Ontario: $54,132. Pennsylvania's GDP per capita is 1.4 times (42%) higher than Ontario's.
Official Websites
Pennsylvania official website · Ontario official website
More Size Comparisons
All Pennsylvania 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.