Montenegro is about 10 times smaller than Illinois.

Illinois is approximately 143,961 sq km, while Montenegro is approximately 13,812 sq km, making Montenegro 9.59% the size of Illinois. Meanwhile, the population of Illinois is ~12.8 million people (12.2 million fewer people live in Montenegro).
This to-scale comparison of Illinois vs. Montenegro uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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