The map above shows District of Columbia and Northern Ireland side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
District of Columbia vs Northern Ireland Geography
Land area: District of Columbia has a land area of 61 square miles (158 km²), while Northern Ireland has 5,236 square miles (13,562 km²). Northern Ireland's land area is 85.8 times larger than District of Columbia's.
Total area: District of Columbia: 68 square miles (177 km²) vs Northern Ireland: 5,456 square miles (14,130 km²), including inland and coastal water. Northern Ireland's total area is 79.8 times larger than District of Columbia's.
Length: District of Columbia is 13 miles (22 km) long from north to south; Northern Ireland is 83 miles (134 km). Northern Ireland's north-south length is 6.4 times (538%) longer than District of Columbia's.
Width: District of Columbia spans 12 miles (19 km) east to west; Northern Ireland spans 107 miles (173 km). Northern Ireland's east-west width is 8.9 times (792%) wider than District of Columbia's.
Highest point: District of Columbia's highest point is Fort Reno at 429 feet (131 m); Northern Ireland's is Slieve Donard at 2,789 feet (850 m). Slieve Donard is 2,360 feet higher than Fort Reno.
Lowest point: District of Columbia's lowest point is Potomac River at 0 feet; Northern Ireland's is Irish Sea at 0 feet. Both lowest points are at or near sea level.
District of Columbia vs Northern Ireland Population and History
Population: District of Columbia has a population of 702,250 (2024), while Northern Ireland has 1,905,000 (2022). Northern Ireland's population is 2.7 times (171%) larger than District of Columbia's.
Population density: District of Columbia: 11,493.5 people per square mile vs Northern Ireland: 363.8. District of Columbia's population density is 31.6 times higher than Northern Ireland's.
Biggest city: District of Columbia's biggest city is Washington with 702,250 people; Northern Ireland's is Belfast with 348,005. Washington's population is 2.0 times (102%) larger than Belfast's.
History: District of Columbia: The federal district, established by the Residence Act on July 16, 1790; not a state. Northern Ireland: A country within the United Kingdom; created by the partition of Ireland on May 3, 1921. In its current form, District of Columbia is the older of the two by 131 years.
District of Columbia vs Northern Ireland Economy
GDP: District of Columbia's GDP is $184.3 billion (2024) vs Northern Ireland's $58.8 billion. District of Columbia's economic output is 3.1 times (213%) larger than Northern Ireland's.
GDP per capita: District of Columbia: $262,439 per person vs Northern Ireland: $30,686. District of Columbia's GDP per capita is 8.6 times (755%) higher than Northern Ireland's.
Official Websites
District of Columbia official website · Northern Ireland official website
More Size Comparisons
All District of Columbia 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.