New Jersey is about 3.7 times smaller than Ireland.

Ireland is approximately 70,273 sq km, while New Jersey is approximately 19,211 sq km, making New Jersey 27.34% the size of Ireland. Meanwhile, the population of Ireland is ~5.3 million people (3.5 million more people live in New Jersey).
This to-scale comparison of Ireland vs. New Jersey uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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