State size comparison
compared to
Illinois is about 1.4 times smaller than South Dakota.
South Dakota is approximately 196,540 sq km, while Illinois is approximately 143,961 sq km, making Illinois 73.25% the size of South Dakota. Meanwhile, the population of South Dakota is ~814,180 people (12.0 million more people live in Illinois).
Tip:
This to-scale comparison of
South Dakota
vs.
Illinois
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Compare further: Illinois vs. South Dakota
Flip Comparison · See true size
See Illinois on top of South Dakota
→
Quality of Life Comparison · 14 statistics
Be 50.0% less likely to be unemployed in South Dakota
→
Cost of Living Comparison · 7 categories - 2026 data
South Dakota is 15.5% cheaper than Illinois
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City Size Comparison · See true size
Compare the size of Chicago vs New York City
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