The map above shows New Jersey and Northern Ireland side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
New Jersey vs Northern Ireland Geography
Land area: New Jersey has a land area of 7,355 square miles (19,049 km²), while Northern Ireland has 5,236 square miles (13,562 km²). New Jersey's land area is 1.4 times (40%) larger than Northern Ireland's.
Total area: New Jersey: 8,719 square miles (22,583 km²) vs Northern Ireland: 5,456 square miles (14,130 km²), including inland and coastal water. New Jersey's total area is 1.6 times (60%) larger than Northern Ireland's.
Length: New Jersey is 169 miles (271 km) long from north to south; Northern Ireland is 83 miles (134 km). New Jersey's north-south length is 2.0 times (104%) longer than Northern Ireland's.
Width: New Jersey spans 129 miles (207 km) east to west; Northern Ireland spans 107 miles (173 km). New Jersey's east-west width is 1.2 times (21%) wider than Northern Ireland's.
Highest point: New Jersey's highest point is High Point at 1,798 feet (548 m); Northern Ireland's is Slieve Donard at 2,789 feet (850 m). Slieve Donard is 991 feet higher than High Point.
Lowest point: New Jersey's lowest point is Atlantic Ocean at 0 feet; Northern Ireland's is Irish Sea at 0 feet. Both lowest points are at or near sea level.
New Jersey vs Northern Ireland Population and History
Population: New Jersey has a population of 9,500,851 (2024), while Northern Ireland has 1,905,000 (2022). New Jersey's population is 5.0 times (399%) larger than Northern Ireland's.
Population density: New Jersey: 1,291.8 people per square mile vs Northern Ireland: 363.8. New Jersey's population density is 3.6 times (255%) higher than Northern Ireland's.
Biggest city: New Jersey's biggest city is Newark with 317,303 people; Northern Ireland's is Belfast with 348,005. Belfast's population is 1.1 times (10%) larger than Newark's.
History: New Jersey: Admitted to the Union on December 18, 1787, as the 3rd state. Northern Ireland: A country within the United Kingdom; created by the partition of Ireland on May 3, 1921. In its current form, New Jersey is the older of the two by 134 years.
New Jersey vs Northern Ireland Economy
GDP: New Jersey's GDP is $846.0 billion (2024) vs Northern Ireland's $58.8 billion. New Jersey's economic output is 14.4 times larger than Northern Ireland's.
GDP per capita: New Jersey: $89,045 per person vs Northern Ireland: $30,686. New Jersey's GDP per capita is 2.9 times (190%) higher than Northern Ireland's.
Official Websites
New Jersey official website · Northern Ireland official website
More Size Comparisons
All New Jersey 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.