State size comparison

compared to

South Dakota is around the same size as Idaho.

Idaho is approximately 214,314 sq km, while South Dakota is approximately 196,540 sq km, making South Dakota 91.71% the size of Idaho. Meanwhile, the population of Idaho is ~1.6 million people (753,402 fewer people live in South Dakota).
Tip: This to-scale comparison of Idaho 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. Idaho
Flip Comparison · See true size
See South Dakota on top of Idaho
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Quality of Life Comparison · 12 statistics
Be 45.8% more likely to be unemployed in Idaho
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Cost of Living Comparison · 7 categories - 2026 data
Idaho is 21.0% more expensive than South Dakota
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