Illinois is about 1.2 times bigger than Mississippi.

Mississippi is approximately 121,489 sq km, while Illinois is approximately 143,961 sq km, making Illinois 18% larger than Mississippi. Meanwhile, the population of Mississippi is ~3.0 million people (9.9 million more people live in Illinois).
This to-scale comparison of Mississippi vs. Illinois uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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