The map above shows Maryland and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Maryland vs Ontario Geography
Land area: Maryland has a land area of 9,711 square miles (25,151 km²), while Ontario has 354,342 square miles (917,741 km²). Ontario's land area is 36.5 times larger than Maryland's.
Total area: Maryland: 12,406 square miles (32,131 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water. Ontario's total area is 33.5 times larger than Maryland's.
Length: Maryland is 231 miles (371 km) long from north to south; Ontario is 1,085 miles (1,747 km). Ontario's north-south length is 4.7 times (370%) longer than Maryland's.
Width: Maryland spans 243 miles (391 km) east to west; Ontario spans 1,013 miles (1,630 km). Ontario's east-west width is 4.2 times (317%) wider than Maryland's.
Highest point: Maryland's highest point is Hoye-Crest at 3,362 feet (1,025 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m). Hoye-Crest is 1,088 feet higher than Ishpatina Ridge.
Lowest point: Maryland'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.
Maryland vs Ontario Population and History
Population: Maryland has a population of 6,263,220 (2024), while Ontario has 16,136,480 (2026). Ontario's population is 2.6 times (158%) larger than Maryland's.
Population density: Maryland: 645.0 people per square mile vs Ontario: 45.5. Maryland's population density is 14.2 times higher than Ontario's.
Biggest city: Maryland's biggest city is Baltimore with 568,271 people; Ontario's is Toronto with 2,794,356. Toronto's population is 4.9 times (392%) larger than Baltimore's.
Largest metro area: Maryland's largest metropolitan area is Washington-Arlington-Alexandria, DC-VA-MD-WV metro area (6,436,489 people) vs Ontario's Toronto CMA (6,202,225). Washington-Arlington-Alexandria, DC-VA-MD-WV metro area and Toronto CMA have about the same population.
History: Maryland: Admitted to the Union on April 28, 1788, as the 7th state. Ontario: Joined Confederation on July 1, 1867, as one of the four founding provinces. In its current form, Maryland is the older of the two by 79 years.
Maryland vs Ontario Economy
GDP: Maryland's GDP is $546.0 billion (2024) vs Ontario's $873.9 billion. Ontario's economic output is 1.6 times (60%) larger than Maryland's.
GDP per capita: Maryland: $87,180 per person vs Ontario: $54,132. Maryland's GDP per capita is 1.6 times (61%) higher than Ontario's.
Official Websites
Maryland official website · Ontario official website
More Size Comparisons
All Maryland 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.