The map above shows United States and Northern Ireland side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
United States vs Northern Ireland Geography
Land area: United States has a land area of 3,533,467 square miles (9,151,637 km²), while Northern Ireland has 5,236 square miles (13,562 km²). United States' land area is 674.8 times larger than Northern Ireland's.
Total area: United States: 3,802,784 square miles (9,849,165 km²) vs Northern Ireland: 5,456 square miles (14,130 km²), including inland and coastal water. United States' total area is 697.0 times larger than Northern Ireland's.
Length: United States is 3,628 miles (5,839 km) long from north to south; Northern Ireland is 83 miles (134 km). United States' north-south length is 43.7 times longer than Northern Ireland's.
Width: United States spans 4,824 miles (7,763 km) east to west; Northern Ireland spans 107 miles (173 km). United States' east-west width is 45.1 times wider than Northern Ireland's.
Highest point: United States's highest point is Denali at 20,308 feet (6,190 m); Northern Ireland's is Slieve Donard at 2,789 feet (850 m). Denali is 17,519 feet higher than Slieve Donard.
Lowest point: United States's lowest point is Death Valley at -279 feet; Northern Ireland's is Irish Sea at 0 feet. United States's lowest point is 279 feet lower.
United States vs Northern Ireland Population and History
Population: United States has a population of 340,110,988 (2024), while Northern Ireland has 1,905,000 (2022). United States' population is 178.5 times larger than Northern Ireland's.
Population density: United States: 96.3 people per square mile vs Northern Ireland: 363.8. Northern Ireland's population density is 3.8 times (278%) higher than United States'.
Biggest city: United States's biggest city is New York with 8,478,072 people; Northern Ireland's is Belfast with 348,005. New York's population is 24.4 times larger than Belfast's.
History: United States: Declared independence on July 4, 1776. Northern Ireland: A country within the United Kingdom; created by the partition of Ireland on May 3, 1921. In its current form, United States is the older of the two by 145 years.
United States vs Northern Ireland Economy
GDP: United States's GDP is $30,769.7 billion (2025) vs Northern Ireland's $58.8 billion. United States' economic output is 523.3 times larger than Northern Ireland's.
GDP per capita: United States: $89,599 per person vs Northern Ireland: $30,686. United States' GDP per capita is 2.9 times (192%) higher than Northern Ireland's.
Official Websites
United States official website · Northern Ireland official website
More Size Comparisons
All United States 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.