Pennsylvania is about 1.2 times smaller than Illinois.

Illinois is approximately 143,961 sq km, while Pennsylvania is approximately 116,075 sq km, making Pennsylvania 80.63% the size of Illinois. Meanwhile, the population of Illinois is ~12.8 million people (128,253 fewer people live in Pennsylvania).
This to-scale comparison of Illinois vs. Pennsylvania uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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