Country size comparison

compared to

Illinois is about 2.6 times smaller than Japan.

Japan is approximately 377,915 sq km, while Illinois is approximately 143,961 sq km, making Illinois 38.09% the size of Japan. Meanwhile, the population of Japan is ~124.2 million people (111.4 million fewer people live in Illinois).
This to-scale comparison of Japan vs. Illinois uses the Mercator projection, which distorts the size of regions near the poles. Learn more.
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