State size comparison

compared to

South Dakota is about 1.9 times smaller than Montana.

Montana is approximately 376,979 sq km, while South Dakota is approximately 196,540 sq km, making South Dakota 52.14% the size of Montana. Meanwhile, the population of Montana is ~989,415 people (175,235 fewer people live in South Dakota).
Tip: This to-scale comparison of Montana 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. Montana
Flip Comparison · See true size
See South Dakota on top of Montana
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Quality of Life Comparison · 12 statistics
Be 54.2% more likely to be unemployed in Montana
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Cost of Living Comparison · 7 categories - 2026 data
Montana is 35.8% more expensive than South Dakota
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