The map above shows California and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
California vs Ontario Geography
Land area: California has a land area of 155,859 square miles (403,673 km²), while Ontario has 354,342 square miles (917,741 km²). Ontario's land area is 2.3 times (127%) larger than California's.
Total area: California: 163,694 square miles (423,965 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water. Ontario's total area is 2.5 times (154%) larger than California's.
Length: California is 761 miles (1,224 km) long from north to south; Ontario is 1,085 miles (1,747 km). Ontario's north-south length is 1.4 times (43%) longer than California's.
Width: California spans 706 miles (1,137 km) east to west; Ontario spans 1,013 miles (1,630 km). Ontario's east-west width is 1.4 times (43%) wider than California's.
Highest point: California's highest point is Mount Whitney at 14,484 feet (4,415 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m). Mount Whitney is 12,210 feet higher than Ishpatina Ridge.
Lowest point: California's lowest point is Death Valley at -279 feet; Ontario's is Hudson Bay at 0 feet. California's lowest point is 279 feet lower.
California vs Ontario Population and History
Population: California has a population of 39,431,263 (2024), while Ontario has 16,136,480 (2026). California's population is 2.4 times (144%) larger than Ontario's.
Population density: California: 253.0 people per square mile vs Ontario: 45.5. California's population density is 5.6 times (456%) higher than Ontario's.
Biggest city: California's biggest city is Los Angeles with 3,878,704 people; Ontario's is Toronto with 2,794,356. Los Angeles' population is 1.4 times (39%) larger than Toronto's.
Largest metro area: California's largest metropolitan area is Los Angeles-Long Beach-Anaheim, CA metro area (12,927,614 people) vs Ontario's Toronto CMA (6,202,225). Los Angeles-Long Beach-Anaheim, CA metro area's population is 2.1 times (108%) larger than Toronto CMA's.
History: California: Admitted to the Union on September 9, 1850, as the 31st state. Ontario: Joined Confederation on July 1, 1867, as one of the four founding provinces. In its current form, California is the older of the two by 17 years.
California vs Ontario Economy
GDP: California's GDP is $4,048.1 billion (2024) vs Ontario's $873.9 billion. California's economic output is 4.6 times (363%) larger than Ontario's.
GDP per capita: California: $102,662 per person vs Ontario: $54,132. California's GDP per capita is 1.9 times (90%) higher than Ontario's.
Official Websites
California official website · Ontario official website
More Size Comparisons
All California 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.