Illinois is about 15 times smaller than Saudi Arabia.

Saudi Arabia is approximately 2,149,690 sq km, while Illinois is approximately 143,961 sq km, making Illinois 6.7% the size of Saudi Arabia. Meanwhile, the population of Saudi Arabia is ~35.4 million people (22.5 million fewer people live in Illinois).
This to-scale comparison of Saudi Arabia vs. Illinois uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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