State size comparison
South Dakota, USA
compared to
Illinois, USA
South Dakota is about 1.4 times bigger than Illinois.
Illinois is approximately 143,961 sq km, while South Dakota is approximately 196,540 sq km, making South Dakota 37% larger than Illinois. Meanwhile, the population of Illinois is ~12.8 million people (12.0 million fewer people live in South Dakota).
We have positioned the outline of Illinois near the middle of South Dakota.
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This to-scale comparison of
Illinois
vs.
South Dakota
uses the Mercator projection, which distorts the size of regions near the poles. Learn more.
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