Saudi Arabia is about 15 times bigger than Illinois.

Illinois is approximately 143,961 sq km, while Saudi Arabia is approximately 2,149,690 sq km, making Saudi Arabia 1,393% larger than Illinois. Meanwhile, the population of Illinois is ~12.8 million people (22.5 million more people live in Saudi Arabia).
This to-scale comparison of Illinois vs. Saudi Arabia uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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