Illinois is about 1.9 times bigger than Serbia.

Serbia is approximately 77,474 sq km, while Illinois is approximately 143,961 sq km, making Illinois 86% larger than Serbia. Meanwhile, the population of Serbia is ~6.7 million people (6.1 million more people live in Illinois).
This to-scale comparison of Serbia vs. Illinois uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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