Illinois is about 1.7 times smaller than Michigan.

Michigan is approximately 250,493 sq km, while Illinois is approximately 143,961 sq km, making Illinois 57.47% the size of Michigan. Meanwhile, the population of Michigan is ~9.9 million people (2.9 million more people live in Illinois).
This to-scale comparison of Michigan vs. Illinois uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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