The map above shows Ohio and Northern Ireland side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Ohio vs Northern Ireland Geography
Land area: Ohio has a land area of 40,859 square miles (105,824 km²), while Northern Ireland has 5,236 square miles (13,562 km²). Ohio's land area is 7.8 times (680%) larger than Northern Ireland's.
Total area: Ohio: 44,826 square miles (116,098 km²) vs Northern Ireland: 5,456 square miles (14,130 km²), including inland and coastal water. Ohio's total area is 8.2 times (722%) larger than Northern Ireland's.
Length: Ohio is 291 miles (468 km) long from north to south; Northern Ireland is 83 miles (134 km). Ohio's north-south length is 3.5 times (251%) longer than Northern Ireland's.
Width: Ohio spans 317 miles (510 km) east to west; Northern Ireland spans 107 miles (173 km). Ohio's east-west width is 3.0 times (196%) wider than Northern Ireland's.
Highest point: Ohio's highest point is Campbell Hill at 1,547 feet (472 m); Northern Ireland's is Slieve Donard at 2,789 feet (850 m). Slieve Donard is 1,242 feet higher than Campbell Hill.
Lowest point: Ohio's lowest point is Ohio River at 455 feet; Northern Ireland's is Irish Sea at 0 feet. Northern Ireland's lowest point is 455 feet lower.
Ohio vs Northern Ireland Population and History
Population: Ohio has a population of 11,883,304 (2024), while Northern Ireland has 1,905,000 (2022). Ohio's population is 6.2 times (524%) larger than Northern Ireland's.
Population density: Ohio: 290.8 people per square mile vs Northern Ireland: 363.8. Northern Ireland's population density is 1.3 times (25%) higher than Ohio's.
Biggest city: Ohio's biggest city is Columbus with 933,263 people; Northern Ireland's is Belfast with 348,005. Columbus' population is 2.7 times (168%) larger than Belfast's.
History: Ohio: Admitted to the Union on March 1, 1803, as the 17th state. Northern Ireland: A country within the United Kingdom; created by the partition of Ireland on May 3, 1921. In its current form, Ohio is the older of the two by 118 years.
Ohio vs Northern Ireland Economy
GDP: Ohio's GDP is $923.1 billion (2024) vs Northern Ireland's $58.8 billion. Ohio's economic output is 15.7 times larger than Northern Ireland's.
GDP per capita: Ohio: $77,684 per person vs Northern Ireland: $30,686. Ohio's GDP per capita is 2.5 times (153%) higher than Northern Ireland's.
Official Websites
Ohio official website · Northern Ireland official website
More Size Comparisons
All Ohio 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.