The map above shows Guam and Ontario side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Guam vs Ontario Geography
Land area
- Guam has a land area of 210 square miles (544 km²), while Ontario has 354,342 square miles (917,741 km²).
- Ontario's land area is 1,687.0 times larger than Guam's.
Total area
- Guam: 210 square miles (544 km²) vs Ontario: 415,598 square miles (1,076,395 km²), including inland and coastal water.
- Ontario's total area is 1,978.7 times larger than Guam's.
Length
- Guam is 27 miles (43 km) long from north to south; Ontario is 1,085 miles (1,747 km).
- Ontario's north-south length is 40.2 times longer than Guam's.
Width
- Guam spans 22 miles (35 km) east to west; Ontario spans 1,013 miles (1,630 km).
- Ontario's east-west width is 46.0 times wider than Guam's.
Highest point
- Guam's highest point is Mount Lamlam at 1,332 feet (406 m); Ontario's is Ishpatina Ridge at 2,274 feet (693 m).
- Ishpatina Ridge is 942 feet higher than Mount Lamlam.
Lowest point
- Guam's lowest point is Pacific Ocean at 0 feet; Ontario's is Hudson Bay at 0 feet.
- Both lowest points are at or near sea level.
Guam vs Ontario Population and History
Population
- Guam has a population of 153,836 (2020), while Ontario has 16,136,480 (2026).
- Ontario's population is 104.9 times larger than Guam's.
Population density
- Guam: 732.6 people per square mile vs Ontario: 45.5.
- Guam's population density is 16.1 times higher than Ontario's.
History
- Guam: A US territory since 1898.
- Ontario: Joined Confederation on July 1, 1867, as one of the four founding provinces.
- In its current form, Ontario is the older of the two by 31 years.
Official Websites
Guam official website · Ontario official website
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More Size Comparisons
All Guam 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.