The map above shows Australian Capital Territory and Northern Ireland side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Australian Capital Territory vs Northern Ireland Geography
Land area: Australian Capital Territory has a land area of 910 square miles (2,358 km²), while Northern Ireland has 5,236 square miles (13,562 km²). Northern Ireland's land area is 5.8 times (475%) larger than Australian Capital Territory's.
Total area: Australian Capital Territory: 910 square miles (2,358 km²) vs Northern Ireland: 5,456 square miles (14,130 km²), including inland and coastal water. Northern Ireland's total area is 6.0 times (499%) larger than Australian Capital Territory's.
Length: Australian Capital Territory is 54 miles (87 km) long from north to south; Northern Ireland is 83 miles (134 km). Northern Ireland's north-south length is 1.5 times (54%) longer than Australian Capital Territory's.
Width: Australian Capital Territory spans 38 miles (61 km) east to west; Northern Ireland spans 107 miles (173 km). Northern Ireland's east-west width is 2.8 times (182%) wider than Australian Capital Territory's.
Highest point: Australian Capital Territory's highest point is Bimberi Peak at 6,273 feet (1,912 m); Northern Ireland's is Slieve Donard at 2,789 feet (850 m). Bimberi Peak is 3,484 feet higher than Slieve Donard.
Lowest point: Australian Capital Territory's lowest point is Molonglo River at 1,407 feet; Northern Ireland's is Irish Sea at 0 feet. Northern Ireland's lowest point is 1,407 feet lower.
Australian Capital Territory vs Northern Ireland Population and History
Population: Australian Capital Territory has a population of 486,231 (2025), while Northern Ireland has 1,905,000 (2022). Northern Ireland's population is 3.9 times (292%) larger than Australian Capital Territory's.
Population density: Australian Capital Territory: 534.3 people per square mile vs Northern Ireland: 363.8. Australian Capital Territory's population density is 1.5 times (47%) higher than Northern Ireland's.
History: Australian Capital Territory: Established as the Federal Capital Territory on January 1, 1911. Northern Ireland: A country within the United Kingdom; created by the partition of Ireland on May 3, 1921. In its current form, Australian Capital Territory is the older of the two by 10 years.
Australian Capital Territory vs Northern Ireland Economy
GDP: Australian Capital Territory's GDP is $38.0 billion (2025) vs Northern Ireland's $58.8 billion. Northern Ireland's economic output is 1.5 times (55%) larger than Australian Capital Territory's.
GDP per capita: Australian Capital Territory: $78,152 per person vs Northern Ireland: $30,686. Australian Capital Territory's GDP per capita is 2.5 times (155%) higher than Northern Ireland's.
Official Websites
Australian Capital Territory official website · Northern Ireland official website
More Size Comparisons
All Australian Capital Territory size comparisons · All Northern Ireland 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.