New Jersey is about 2.2 times smaller than Denmark.

Denmark is approximately 43,094 sq km, while New Jersey is approximately 19,211 sq km, making New Jersey 44.58% the size of Denmark. Meanwhile, the population of Denmark is ~5.9 million people (2.9 million more people live in New Jersey).
This to-scale comparison of Denmark vs. New Jersey uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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