The map above shows District of Columbia and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
District of Columbia vs Ontario Geography
Land area: District of Columbia has a land area of 61 square miles (158 km²), while Ontario has 354,342 square miles (917,741 km²). Ontario's land area is 5,808.5 times larger than District of Columbia's.
Total area: District of Columbia: 68 square miles (177 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water. Ontario's total area is 6,081.3 times larger than District of Columbia's.
Length: District of Columbia is 13 miles (22 km) long from north to south; Ontario is 1,085 miles (1,747 km). Ontario's north-south length is 83.5 times longer than District of Columbia's.
Width: District of Columbia spans 12 miles (19 km) east to west; Ontario spans 1,013 miles (1,630 km). Ontario's east-west width is 84.4 times wider than District of Columbia's.
Highest point: District of Columbia's highest point is Fort Reno at 429 feet (131 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m). Ishpatina Ridge is 1,845 feet higher than Fort Reno.
Lowest point: District of Columbia's lowest point is Potomac River at 0 feet; Ontario's is Hudson Bay at 0 feet. Both lowest points are at or near sea level.
District of Columbia vs Ontario Population and History
Population: District of Columbia has a population of 702,250 (2024), while Ontario has 16,136,480 (2026). Ontario's population is 23.0 times larger than District of Columbia's.
Population density: District of Columbia: 11,493.5 people per square mile vs Ontario: 45.5. District of Columbia's population density is 252.6 times higher than Ontario's.
Biggest city: District of Columbia's biggest city is Washington with 702,250 people; Ontario's is Toronto with 2,794,356. Toronto's population is 4.0 times (298%) larger than Washington's.
Largest metro area: District of Columbia'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: District of Columbia: The federal district, established by the Residence Act on July 16, 1790; not a state. Ontario: Joined Confederation on July 1, 1867, as one of the four founding provinces. In its current form, District of Columbia is the older of the two by 77 years.
District of Columbia vs Ontario Economy
GDP: District of Columbia's GDP is $184.3 billion (2024) vs Ontario's $873.9 billion. Ontario's economic output is 4.7 times (374%) larger than District of Columbia's.
GDP per capita: District of Columbia: $262,439 per person vs Ontario: $54,132. District of Columbia's GDP per capita is 4.8 times (385%) higher than Ontario's.
Official Websites
District of Columbia official website · Ontario official website
More Size Comparisons
All District of Columbia 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.