Jersey is about 1,241 times smaller than Illinois.

Illinois is approximately 143,961 sq km, while Jersey is approximately 116 sq km, making Jersey 0.08% the size of Illinois. Meanwhile, the population of Illinois is ~12.8 million people (12.7 million fewer people live in Jersey).
This to-scale comparison of Illinois vs. Jersey uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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