State size comparison

compared to

Colorado is about 1.9 times bigger than Illinois.

Illinois is approximately 143,961 sq km, while Colorado is approximately 268,627 sq km, making Colorado 87% larger than Illinois. Meanwhile, the population of Illinois is ~12.8 million people (7.8 million fewer people live in Colorado).
Tip: This to-scale comparison of Illinois vs. Colorado uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Colorado vs. Illinois
Flip Comparison · See true size
See Colorado on top of Illinois
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Cost of Living Comparison · 7 categories - 2026 data
Illinois is 3.5% cheaper than Colorado
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