State size comparison

compared to

Idaho is about 1.5 times bigger than Illinois.

Illinois is approximately 143,961 sq km, while Idaho is approximately 214,314 sq km, making Idaho 49% larger than Illinois. Meanwhile, the population of Illinois is ~12.8 million people (11.3 million fewer people live in Idaho).
Tip: This to-scale comparison of Illinois vs. Idaho uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Idaho vs. Illinois

Flip Comparison · See true size
See Idaho on top of Illinois
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Quality of Life Comparison · 15 statistics
Make 44.1% more money in Illinois
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Cost of Living Comparison · 7 categories - 2026 data
Illinois is 10.9% more expensive than Idaho
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