The map above shows Ireland and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Ireland vs Ontario Geography
Land area: Ireland has a land area of 26,596 square miles (68,883 km²), while Ontario has 354,342 square miles (917,741 km²). Ontario's land area is 13.3 times larger than Ireland's.
Total area: Ireland: 27,133 square miles (70,273 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water. Ontario's total area is 15.3 times larger than Ireland's.
Length: Ireland is 287 miles (462 km) long from north to south; Ontario is 1,085 miles (1,747 km). Ontario's north-south length is 3.8 times (278%) longer than Ireland's.
Width: Ireland spans 191 miles (308 km) east to west; Ontario spans 1,013 miles (1,630 km). Ontario's east-west width is 5.3 times (430%) wider than Ireland's.
Highest point: Ireland's highest point is Carrauntoohil at 3,406 feet (1,038 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m). Carrauntoohil is 1,132 feet higher than Ishpatina Ridge.
Lowest point: Ireland's lowest point is Atlantic Ocean at 0 feet; Ontario's is Hudson Bay at 0 feet. Both lowest points are at or near sea level.
Ireland vs Ontario Population and History
Population: Ireland has a population of 5,525,600 (2026), while Ontario has 16,136,480 (2026). Ontario's population is 2.9 times (192%) larger than Ireland's.
Population density: Ireland: 207.8 people per square mile vs Ontario: 45.5. Ireland's population density is 4.6 times (357%) higher than Ontario's.
Biggest city: Ireland's biggest city is Dublin with 592,713 people; Ontario's is Toronto with 2,794,356. Toronto's population is 4.7 times (371%) larger than Dublin's.
Largest metro area: Ireland's largest metropolitan area is Greater Dublin Area (2,082,605 people) vs Ontario's Toronto CMA (6,202,225). Toronto CMA's population is 3.0 times (198%) larger than Greater Dublin Area's.
History: Ireland: Independent since December 6, 1922, as the Irish Free State; a republic since 1949. 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 55 years.
Ireland vs Ontario Economy
GDP: Ireland's GDP is $721.7 billion (2025) vs Ontario's $873.9 billion. Ontario's economic output is 1.2 times (21%) larger than Ireland's.
GDP per capita: Ireland: $131,593 per person vs Ontario: $54,132. Ireland's GDP per capita is 2.4 times (143%) higher than Ontario's.
Official Websites
Ireland official website · Ontario official website
More Size Comparisons
All Ireland 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.