Country size comparison

compared to

Belgium is about 4.7 times smaller than Illinois.

Illinois is approximately 143,961 sq km, while Belgium is approximately 30,528 sq km, making Belgium 21.21% the size of Illinois. Meanwhile, the population of Illinois is ~12.8 million people (983,294 fewer people live in Belgium).
Tip: This to-scale comparison of Illinois vs. Belgium uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Belgium vs. Illinois

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Cost of Living Comparison · 7 categories - 2026 data
Illinois is 10.9% more expensive than Belgium overall
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