Czech Republic is about 1.8 times smaller than Illinois.

Illinois is approximately 143,961 sq km, while Czech Republic is approximately 78,867 sq km, making Czech Republic 54.78% the size of Illinois. Meanwhile, the population of Illinois is ~12.8 million people (2.1 million fewer people live in Czech Republic).
This to-scale comparison of Illinois vs. Czech Republic uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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