The map above shows Northern Ireland and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Northern Ireland vs Ontario Geography
Land area: Northern Ireland has a land area of 5,236 square miles (13,562 km²), while Ontario has 354,342 square miles (917,741 km²). Ontario's land area is 67.7 times larger than Northern Ireland's.
Total area: Northern Ireland: 5,456 square miles (14,130 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water. Ontario's total area is 76.2 times larger than Northern Ireland's.
Length: Northern Ireland is 83 miles (134 km) long from north to south; Ontario is 1,085 miles (1,747 km). Ontario's north-south length is 13.1 times longer than Northern Ireland's.
Width: Northern Ireland spans 107 miles (173 km) east to west; Ontario spans 1,013 miles (1,630 km). Ontario's east-west width is 9.5 times (847%) wider than Northern Ireland's.
Highest point: Northern Ireland's highest point is Slieve Donard at 2,789 feet (850 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m). Slieve Donard is 515 feet higher than Ishpatina Ridge.
Lowest point: Northern Ireland's lowest point is Irish Sea at 0 feet; Ontario's is Hudson Bay at 0 feet. Both lowest points are at or near sea level.
Northern Ireland vs Ontario Population and History
Population: Northern Ireland has a population of 1,905,000 (2022), while Ontario has 16,136,480 (2026). Ontario's population is 8.5 times (747%) larger than Northern Ireland's.
Population density: Northern Ireland: 363.8 people per square mile vs Ontario: 45.5. Northern Ireland's population density is 8.0 times (700%) higher than Ontario's.
Biggest city: Northern Ireland's biggest city is Belfast with 348,005 people; Ontario's is Toronto with 2,794,356. Toronto's population is 8.0 times (703%) larger than Belfast's.
History: Northern Ireland: A country within the United Kingdom; created by the partition of Ireland on May 3, 1921. 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 54 years.
Northern Ireland vs Ontario Economy
GDP: Northern Ireland's GDP is $58.8 billion (2022) vs Ontario's $873.9 billion. Ontario's economic output is 14.9 times larger than Northern Ireland's.
GDP per capita: Northern Ireland: $30,686 per person vs Ontario: $54,132. Ontario's GDP per capita is 1.8 times (76%) higher than Northern Ireland's.
Official Websites
Northern Ireland official website · Ontario official website
More Size Comparisons
All Northern 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.