The map above shows Northern Ireland and United Kingdom side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Northern Ireland vs United Kingdom Geography
Land area: Northern Ireland has a land area of 5,236 square miles (13,562 km²), while United Kingdom has 93,410 square miles (241,930 km²). United Kingdom's land area is 17.8 times larger than Northern Ireland's.
Total area: Northern Ireland: 5,456 square miles (14,130 km²) vs United Kingdom: 94,058 square miles (243,610 km²), including inland and coastal water. United Kingdom's total area is 17.2 times larger than Northern Ireland's.
Length: Northern Ireland is 83 miles (134 km) long from north to south; United Kingdom is 747 miles (1,202 km). United Kingdom's north-south length is 9.0 times (800%) longer than Northern Ireland's.
Width: Northern Ireland spans 107 miles (173 km) east to west; United Kingdom spans 429 miles (690 km). United Kingdom's east-west width is 4.0 times (301%) wider than Northern Ireland's.
Highest point: Northern Ireland's highest point is Slieve Donard at 2,789 feet (850 m); United Kingdom's is Ben Nevis at 4,413 feet (1,345 m). Ben Nevis is 1,624 feet higher than Slieve Donard.
Lowest point: Northern Ireland's lowest point is Irish Sea at 0 feet; United Kingdom's is The Fens (Holme Fen) at -10 feet. United Kingdom's lowest point is 10 feet lower.
Northern Ireland vs United Kingdom Population and History
Population: Northern Ireland has a population of 1,905,000 (2022), while United Kingdom has 69,487,000 (2025). United Kingdom's population is 36.5 times larger than Northern Ireland's.
Population density: Northern Ireland: 363.8 people per square mile vs United Kingdom: 743.9. United Kingdom's population density is 2.0 times (104%) higher than Northern Ireland's.
Biggest city: Northern Ireland's biggest city is Belfast with 348,005 people; United Kingdom's is London with 8,825,001. London's population is 25.4 times larger than Belfast's.
History: Northern Ireland: A country within the United Kingdom; created by the partition of Ireland on May 3, 1921. United Kingdom: Formed as the United Kingdom of Great Britain and Ireland on January 1, 1801; took its current form in 1922. In its current form, United Kingdom is the older of the two by 120 years.
Northern Ireland vs United Kingdom Economy
GDP: Northern Ireland's GDP is $58.8 billion (2022) vs United Kingdom's $4,002.6 billion. United Kingdom's economic output is 68.1 times larger than Northern Ireland's.
GDP per capita: Northern Ireland: $30,686 per person vs United Kingdom: $57,602. United Kingdom's GDP per capita is 1.9 times (88%) higher than Northern Ireland's.
Official Websites
Northern Ireland official website · United Kingdom official website
More Size Comparisons
All Northern Ireland size comparisons · All United Kingdom 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.