State size comparison

compared to

Idaho is around the same size as South Dakota.

South Dakota is approximately 196,540 sq km, while Idaho is approximately 214,314 sq km, making Idaho 9% larger than South Dakota. Meanwhile, the population of South Dakota is ~814,180 people (753,402 more people live in Idaho).
Tip: This to-scale comparison of South Dakota vs. Idaho uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Idaho vs. South Dakota
Flip Comparison · See true size
See Idaho on top of South Dakota
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Quality of Life Comparison · 12 statistics
Be 31.4% less likely to be unemployed in South Dakota
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Cost of Living Comparison · 7 categories - 2026 data
South Dakota is 8.9% cheaper than Idaho
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