Illinois is about 1.4 times bigger than Tennessee.

Tennessee is approximately 106,752 sq km, while Illinois is approximately 143,961 sq km, making Illinois 35% larger than Tennessee. Meanwhile, the population of Tennessee is ~6.3 million people (6.5 million more people live in Illinois).
This to-scale comparison of Tennessee vs. Illinois uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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