The map above shows Pennsylvania and Northern Ireland side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Pennsylvania vs Northern Ireland Geography
Land area: Pennsylvania has a land area of 44,742 square miles (115,882 km²), while Northern Ireland has 5,236 square miles (13,562 km²). Pennsylvania's land area is 8.5 times (754%) larger than Northern Ireland's.
Total area: Pennsylvania: 46,054 square miles (119,279 km²) vs Northern Ireland: 5,456 square miles (14,130 km²), including inland and coastal water. Pennsylvania's total area is 8.4 times (744%) larger than Northern Ireland's.
Length: Pennsylvania is 284 miles (458 km) long from north to south; Northern Ireland is 83 miles (134 km). Pennsylvania's north-south length is 3.4 times (242%) longer than Northern Ireland's.
Width: Pennsylvania spans 307 miles (495 km) east to west; Northern Ireland spans 107 miles (173 km). Pennsylvania's east-west width is 2.9 times (187%) wider than Northern Ireland's.
Highest point: Pennsylvania's highest point is Mount Davis at 3,210 feet (978 m); Northern Ireland's is Slieve Donard at 2,789 feet (850 m). Mount Davis is 421 feet higher than Slieve Donard.
Lowest point: Pennsylvania's lowest point is Delaware River at 0 feet; Northern Ireland's is Irish Sea at 0 feet. Both lowest points are at or near sea level.
Pennsylvania vs Northern Ireland Population and History
Population: Pennsylvania has a population of 13,078,751 (2024), while Northern Ireland has 1,905,000 (2022). Pennsylvania's population is 6.9 times (587%) larger than Northern Ireland's.
Population density: Pennsylvania: 292.3 people per square mile vs Northern Ireland: 363.8. Northern Ireland's population density is 1.2 times (24%) higher than Pennsylvania's.
Biggest city: Pennsylvania's biggest city is Philadelphia with 1,573,916 people; Northern Ireland's is Belfast with 348,005. Philadelphia's population is 4.5 times (352%) larger than Belfast's.
History: Pennsylvania: Admitted to the Union on December 12, 1787, as the 2nd state. Northern Ireland: A country within the United Kingdom; created by the partition of Ireland on May 3, 1921. In its current form, Pennsylvania is the older of the two by 134 years.
Pennsylvania vs Northern Ireland Economy
GDP: Pennsylvania's GDP is $1,007.9 billion (2024) vs Northern Ireland's $58.8 billion. Pennsylvania's economic output is 17.1 times larger than Northern Ireland's.
GDP per capita: Pennsylvania: $77,062 per person vs Northern Ireland: $30,686. Pennsylvania's GDP per capita is 2.5 times (151%) higher than Northern Ireland's.
Official Websites
Pennsylvania official website · Northern Ireland official website
More Size Comparisons
All Pennsylvania 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.