The map above shows Illinois and Australian Capital Territory side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Illinois vs Australian Capital Territory Geography
Land area: Illinois has a land area of 55,513 square miles (143,778 km²), while Australian Capital Territory has 910 square miles (2,358 km²). Illinois' land area is 61.0 times larger than Australian Capital Territory's.
Total area: Illinois: 57,913 square miles (149,995 km²) vs Australian Capital Territory: 910 square miles (2,358 km²), including inland and coastal water. Illinois' total area is 63.6 times larger than Australian Capital Territory's.
Length: Illinois is 390 miles (628 km) long from north to south; Australian Capital Territory is 54 miles (87 km). Illinois' north-south length is 7.2 times (622%) longer than Australian Capital Territory's.
Width: Illinois spans 283 miles (456 km) east to west; Australian Capital Territory spans 38 miles (61 km). Illinois' east-west width is 7.4 times (645%) wider than Australian Capital Territory's.
Highest point: Illinois's highest point is Charles Mound at 1,232 feet (376 m); Australian Capital Territory's is Bimberi Peak at 6,273 feet (1,912 m). Bimberi Peak is 5,041 feet higher than Charles Mound.
Lowest point: Illinois's lowest point is Mississippi River at 292 feet; Australian Capital Territory's is Molonglo River at 1,407 feet. Illinois's lowest point is 1,115 feet lower.
Illinois vs Australian Capital Territory Population and History
Population: Illinois has a population of 12,710,158 (2024), while Australian Capital Territory has 486,231 (2025). Illinois' population is 26.1 times larger than Australian Capital Territory's.
Population density: Illinois: 229.0 people per square mile vs Australian Capital Territory: 534.3. Australian Capital Territory's population density is 2.3 times (133%) higher than Illinois'.
Largest metro area: Illinois's largest metropolitan area is Chicago-Naperville-Elgin, IL-IN metro area (9,408,576 people) vs Australian Capital Territory's Greater Canberra (486,231). Chicago-Naperville-Elgin, IL-IN metro area's population is 19.4 times larger than Greater Canberra's.
History: Illinois: Admitted to the Union on December 3, 1818, as the 21st state. Australian Capital Territory: Established as the Federal Capital Territory on January 1, 1911. In its current form, Illinois is the older of the two by 93 years.
Illinois vs Australian Capital Territory Economy
GDP: Illinois's GDP is $1,148.1 billion (2024) vs Australian Capital Territory's $38.0 billion. Illinois' economic output is 30.2 times larger than Australian Capital Territory's.
GDP per capita: Illinois: $90,330 per person vs Australian Capital Territory: $78,152. Illinois' GDP per capita is 1.2 times (16%) higher than Australian Capital Territory's.
Official Websites
Illinois official website · Australian Capital Territory official website
More Size Comparisons
All Illinois 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.