State size comparison

compared to

Michigan is about 1.7 times bigger than Illinois.

Illinois is approximately 143,961 sq km, while Michigan is approximately 250,493 sq km, making Michigan 74% larger than Illinois. Meanwhile, the population of Illinois is ~12.8 million people (2.9 million fewer people live in Michigan).
Tip: This to-scale comparison of Illinois vs. Michigan uses the Mercator projection, which distorts the size of regions near the poles.
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