The map above shows Northern Mariana Islands and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Northern Mariana Islands vs Ontario Geography
Land area: Northern Mariana Islands has a land area of 179 square miles (464 km²), while Ontario has 354,342 square miles (917,741 km²). Ontario's land area is 1,977.9 times larger than Northern Mariana Islands'.
Total area: Northern Mariana Islands: 179 square miles (464 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water. Ontario's total area is 2,319.8 times larger than Northern Mariana Islands'.
Length: Northern Mariana Islands is 326 miles (524 km) long from north to south; Ontario is 1,085 miles (1,747 km). Ontario's north-south length is 3.3 times (233%) longer than Northern Mariana Islands'.
Width: Northern Mariana Islands spans 278 miles (448 km) east to west; Ontario spans 1,013 miles (1,630 km). Ontario's east-west width is 3.6 times (264%) wider than Northern Mariana Islands'.
Highest point: Northern Mariana Islands's highest point is Agrihan at 3,166 feet (965 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m). Agrihan is 892 feet higher than Ishpatina Ridge.
Lowest point: Northern Mariana Islands'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.
Northern Mariana Islands vs Ontario Population and History
Population: Northern Mariana Islands has a population of 47,329 (2020), while Ontario has 16,136,480 (2026). Ontario's population is 340.9 times larger than Northern Mariana Islands'.
Population density: Northern Mariana Islands: 264.4 people per square mile vs Ontario: 45.5. Northern Mariana Islands' population density is 5.8 times (481%) higher than Ontario's.
History: Northern Mariana Islands: A US commonwealth since 1978. 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 111 years.
Official Websites
Northern Mariana Islands official website · Ontario official website
More Size Comparisons
All Northern Mariana Islands 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.