South Dakota is about 1.3 times smaller than Michigan.

Michigan is approximately 250,493 sq km, while South Dakota is approximately 196,540 sq km, making South Dakota 78.46% the size of Michigan. Meanwhile, the population of Michigan is ~9.9 million people (9.1 million fewer people live in South Dakota).
This to-scale comparison of Michigan vs. South Dakota uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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