Illinois is about 3.5 times smaller than Spain.

Spain is approximately 505,370 sq km, while Illinois is approximately 143,961 sq km, making Illinois 28.49% the size of Spain. Meanwhile, the population of Spain is ~47.2 million people (34.3 million fewer people live in Illinois).
This to-scale comparison of Spain vs. Illinois uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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