The map above shows Maine and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Maine vs Ontario Geography
Land area: Maine has a land area of 30,845 square miles (79,888 km²), while Ontario has 354,342 square miles (917,741 km²). Ontario's land area is 11.5 times larger than Maine's.
Total area: Maine: 35,380 square miles (91,634 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water. Ontario's total area is 11.7 times larger than Maine's.
Length: Maine is 311 miles (501 km) long from north to south; Ontario is 1,085 miles (1,747 km). Ontario's north-south length is 3.5 times (249%) longer than Maine's.
Width: Maine spans 203 miles (327 km) east to west; Ontario spans 1,013 miles (1,630 km). Ontario's east-west width is 5.0 times (399%) wider than Maine's.
Highest point: Maine's highest point is Mount Katahdin at 5,253 feet (1,601 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m). Mount Katahdin is 2,979 feet higher than Ishpatina Ridge.
Lowest point: Maine'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.
Maine vs Ontario Population and History
Population: Maine has a population of 1,405,012 (2024), while Ontario has 16,136,480 (2026). Ontario's population is 11.5 times larger than Maine's.
Population density: Maine: 45.6 people per square mile vs Ontario: 45.5. Maine and Ontario have about the same population density.
Biggest city: Maine's biggest city is Portland with 69,568 people; Ontario's is Toronto with 2,794,356. Toronto's population is 40.2 times larger than Portland's.
Largest metro area: Maine's largest metropolitan area is Portland-South Portland, ME metro area (571,534 people) vs Ontario's Toronto CMA (6,202,225). Toronto CMA's population is 10.9 times larger than Portland-South Portland, ME metro area's.
History: Maine: Admitted to the Union on March 15, 1820, as the 23rd state. Ontario: Joined Confederation on July 1, 1867, as one of the four founding provinces. In its current form, Maine is the older of the two by 47 years.
Maine vs Ontario Economy
GDP: Maine's GDP is $99.2 billion (2024) vs Ontario's $873.9 billion. Ontario's economic output is 8.8 times (781%) larger than Maine's.
GDP per capita: Maine: $70,586 per person vs Ontario: $54,132. Maine's GDP per capita is 1.3 times (30%) higher than Ontario's.
Official Websites
Maine official website · Ontario official website
More Size Comparisons
All Maine 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.