State size comparison
compared to
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).
Tip:
This to-scale comparison of
Illinois
vs.
South Dakota
uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: South Dakota vs. Illinois
Flip Comparison · See true size
See South Dakota on top of Illinois
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Quality of Life Comparison · 14 statistics
Be 100.0% more likely to be unemployed in Illinois
→
Cost of Living Comparison · 7 categories - 2026 data
Illinois is 35.6% more expensive than South Dakota
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City Size Comparison · See true size
Compare the size of New York City vs Chicago
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