The map above shows Guam and Australian Capital Territory side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Guam vs Australian Capital Territory Geography
Land area: Guam has a land area of 210 square miles (544 km²), while Australian Capital Territory has 910 square miles (2,358 km²). Australian Capital Territory's land area is 4.3 times (333%) larger than Guam's.
Total area: Guam: 210 square miles (544 km²) vs Australian Capital Territory: 910 square miles (2,358 km²), including inland and coastal water. Australian Capital Territory's total area is 4.3 times (333%) larger than Guam's.
Length: Guam is 27 miles (43 km) long from north to south; Australian Capital Territory is 54 miles (87 km). Australian Capital Territory's north-south length is 2.0 times (100%) longer than Guam's.
Width: Guam spans 22 miles (35 km) east to west; Australian Capital Territory spans 38 miles (61 km). Australian Capital Territory's east-west width is 1.7 times (73%) wider than Guam's.
Highest point: Guam's highest point is Mount Lamlam at 1,332 feet (406 m); Australian Capital Territory's is Bimberi Peak at 6,273 feet (1,912 m). Bimberi Peak is 4,941 feet higher than Mount Lamlam.
Lowest point: Guam's lowest point is Pacific Ocean at 0 feet; Australian Capital Territory's is Molonglo River at 1,407 feet. Guam's lowest point is 1,407 feet lower.
Guam vs Australian Capital Territory Population and History
Population: Guam has a population of 153,836 (2020), while Australian Capital Territory has 486,231 (2025). Australian Capital Territory's population is 3.2 times (216%) larger than Guam's.
Population density: Guam: 732.6 people per square mile vs Australian Capital Territory: 534.3. Guam's population density is 1.4 times (37%) higher than Australian Capital Territory's.
History: Guam: A US territory since 1898. Australian Capital Territory: Established as the Federal Capital Territory on January 1, 1911. In its current form, Guam is the older of the two by 13 years.
Official Websites
Guam official website · Australian Capital Territory official website
More Size Comparisons
All Guam size comparisons · All Australian Capital Territory 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.