State size comparison

compared to

Illinois is about 1.9 times smaller than Colorado.

Colorado is approximately 268,627 sq km, while Illinois is approximately 143,961 sq km, making Illinois 53.59% the size of Colorado. Meanwhile, the population of Colorado is ~5.0 million people (7.8 million more people live in Illinois).
Tip: This to-scale comparison of Colorado vs. Illinois uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Illinois vs. Colorado

Flip Comparison · See true size
See Illinois on top of Colorado
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Quality of Life Comparison · 16 statistics
Be 25.0% less likely to be unemployed in Colorado
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Cost of Living Comparison · 7 categories - 2026 data
Colorado is 6.7% more expensive than Illinois
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