Illinois is about 1.3 times bigger than Bulgaria.

Bulgaria is approximately 110,879 sq km, while Illinois is approximately 143,961 sq km, making Illinois 30% larger than Bulgaria. Meanwhile, the population of Bulgaria is ~6.9 million people (6.0 million more people live in Illinois).
This to-scale comparison of Bulgaria vs. Illinois uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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