Illinois is about 2.5 times bigger than Croatia.

Croatia is approximately 56,594 sq km, while Illinois is approximately 143,961 sq km, making Illinois 154% larger than Croatia. Meanwhile, the population of Croatia is ~4.2 million people (8.6 million more people live in Illinois).
This to-scale comparison of Croatia vs. Illinois uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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