Illinois is about 1.4 times bigger than Ohio.

Ohio is approximately 106,056 sq km, while Illinois is approximately 143,961 sq km, making Illinois 36% larger than Ohio. Meanwhile, the population of Ohio is ~11.5 million people (1.3 million more people live in Illinois).
This to-scale comparison of Ohio vs. Illinois uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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