The map above shows Massachusetts and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Massachusetts vs Ontario Geography
Land area: Massachusetts has a land area of 7,801 square miles (20,204 km²), while Ontario has 354,342 square miles (917,741 km²). Ontario's land area is 45.4 times larger than Massachusetts'.
Total area: Massachusetts: 10,554 square miles (27,335 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water. Ontario's total area is 39.4 times larger than Massachusetts'.
Length: Massachusetts is 123 miles (198 km) long from north to south; Ontario is 1,085 miles (1,747 km). Ontario's north-south length is 8.8 times (782%) longer than Massachusetts'.
Width: Massachusetts spans 185 miles (297 km) east to west; Ontario spans 1,013 miles (1,630 km). Ontario's east-west width is 5.5 times (448%) wider than Massachusetts'.
Highest point: Massachusetts's highest point is Mount Greylock at 3,489 feet (1,063 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m). Mount Greylock is 1,215 feet higher than Ishpatina Ridge.
Lowest point: Massachusetts'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.
Massachusetts vs Ontario Population and History
Population: Massachusetts has a population of 7,136,171 (2024), while Ontario has 16,136,480 (2026). Ontario's population is 2.3 times (126%) larger than Massachusetts'.
Population density: Massachusetts: 914.8 people per square mile vs Ontario: 45.5. Massachusetts' population density is 20.1 times higher than Ontario's.
Biggest city: Massachusetts's biggest city is Boston with 673,458 people; Ontario's is Toronto with 2,794,356. Toronto's population is 4.1 times (315%) larger than Boston's.
Largest metro area: Massachusetts's largest metropolitan area is Boston-Cambridge-Newton, MA-NH metro area (5,025,517 people) vs Ontario's Toronto CMA (6,202,225). Toronto CMA's population is 1.2 times (23%) larger than Boston-Cambridge-Newton, MA-NH metro area's.
History: Massachusetts: Admitted to the Union on February 6, 1788, as the 6th state. Ontario: Joined Confederation on July 1, 1867, as one of the four founding provinces. In its current form, Massachusetts is the older of the two by 79 years.
Massachusetts vs Ontario Economy
GDP: Massachusetts's GDP is $778.5 billion (2024) vs Ontario's $873.9 billion. Ontario's economic output is 1.1 times (12%) larger than Massachusetts'.
GDP per capita: Massachusetts: $109,095 per person vs Ontario: $54,132. Massachusetts' GDP per capita is 2.0 times (102%) higher than Ontario's.
Official Websites
Massachusetts official website · Ontario official website
More Size Comparisons
All Massachusetts 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.