Illinois is around the same size as Wisconsin.

Wisconsin is approximately 140,663 sq km, while Illinois is approximately 143,961 sq km, making Illinois 2% larger than Wisconsin. Meanwhile, the population of Wisconsin is ~5.7 million people (7.1 million more people live in Illinois).
This to-scale comparison of Wisconsin vs. Illinois uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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