Illinois is about 1.4 times bigger than Kentucky.

Kentucky is approximately 102,896 sq km, while Illinois is approximately 143,961 sq km, making Illinois 40% larger than Kentucky. Meanwhile, the population of Kentucky is ~4.3 million people (8.5 million more people live in Illinois).
This to-scale comparison of Kentucky vs. Illinois uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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