State size comparison

compared to

Missouri is about 1.2 times bigger than Illinois.

Illinois is approximately 143,961 sq km, while Missouri is approximately 178,414 sq km, making Missouri 24% larger than Illinois. Meanwhile, the population of Illinois is ~12.8 million people (6.8 million fewer people live in Missouri).
Tip: This to-scale comparison of Illinois vs. Missouri uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Missouri vs. Illinois
Flip Comparison · See true size
See Missouri on top of Illinois
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Cost of Living Comparison · 7 categories - 2026 data
Illinois is 13.4% more expensive than Missouri
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