The map above shows Ohio and Ireland side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Ohio vs Ireland Geography
Land area: Ohio has a land area of 40,859 square miles (105,824 km²), while Ireland has 26,596 square miles (68,883 km²). Ohio's land area is 1.5 times (54%) larger than Ireland's.
Total area: Ohio: 44,826 square miles (116,098 km²) vs Ireland: 27,133 square miles (70,273 km²), including inland and coastal water. Ohio's total area is 1.7 times (65%) larger than Ireland's.
Length: Ohio is 291 miles (468 km) long from north to south; Ireland is 287 miles (462 km). Ohio and Ireland have about the same north-south length.
Width: Ohio spans 317 miles (510 km) east to west; Ireland spans 191 miles (308 km). Ohio's east-west width is 1.7 times (66%) wider than Ireland's.
Highest point: Ohio's highest point is Campbell Hill at 1,547 feet (472 m); Ireland's is Carrauntoohil at 3,406 feet (1,038 m). Carrauntoohil is 1,859 feet higher than Campbell Hill.
Lowest point: Ohio's lowest point is Ohio River at 455 feet; Ireland's is Atlantic Ocean at 0 feet. Ireland's lowest point is 455 feet lower.
Ohio vs Ireland Population and History
Population: Ohio has a population of 11,883,304 (2024), while Ireland has 5,525,600 (2026). Ohio's population is 2.2 times (115%) larger than Ireland's.
Population density: Ohio: 290.8 people per square mile vs Ireland: 207.8. Ohio's population density is 1.4 times (40%) higher than Ireland's.
Biggest city: Ohio's biggest city is Columbus with 933,263 people; Ireland's is Dublin with 592,713. Columbus' population is 1.6 times (57%) larger than Dublin's.
Largest metro area: Ohio's largest metropolitan area is Cincinnati, OH-KY-IN metro area (2,302,815 people) vs Ireland's Greater Dublin Area (2,082,605). Cincinnati, OH-KY-IN metro area's population is 1.1 times (11%) larger than Greater Dublin Area's.
History: Ohio: Admitted to the Union on March 1, 1803, as the 17th state. Ireland: Independent since December 6, 1922, as the Irish Free State; a republic since 1949. In its current form, Ohio is the older of the two by 119 years.
Ohio vs Ireland Economy
GDP: Ohio's GDP is $923.1 billion (2024) vs Ireland's $721.7 billion. Ohio's economic output is 1.3 times (28%) larger than Ireland's.
GDP per capita: Ohio: $77,684 per person vs Ireland: $131,593. Ireland's GDP per capita is 1.7 times (69%) higher than Ohio's.
Average income: Ohio: $64,464 vs Ireland: $87,360 average income per person (per capita personal income). Ireland's average income is 1.4 times (36%) higher than Ohio's.
Official Websites
Ohio official website · Ireland official website
More Size Comparisons
All Ohio size comparisons · All 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.