Illinois is about 1.2 times bigger than New York.

New York is approximately 122,283 sq km, while Illinois is approximately 143,961 sq km, making Illinois 18% larger than New York. Meanwhile, the population of New York is ~19.4 million people (6.5 million fewer people live in Illinois).
This to-scale comparison of New York vs. Illinois uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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