Chile is about 5 times bigger than Illinois.

Illinois is approximately 143,961 sq km, while Chile is approximately 756,102 sq km, making Chile 425% larger than Illinois. Meanwhile, the population of Illinois is ~12.8 million people (5.6 million more people live in Chile).
Tip: This to-scale comparison of Illinois vs. Chile uses the Mercator projection, which distorts the size of regions near the poles.
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