Illinois is about 11 times smaller than Mongolia.

Mongolia is approximately 1,564,116 sq km, while Illinois is approximately 143,961 sq km, making Illinois 9.2% the size of Mongolia. Meanwhile, the population of Mongolia is ~3.2 million people (9.6 million more people live in Illinois).
This to-scale comparison of Mongolia vs. Illinois uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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