South Dakota is about 3.5 times smaller than Texas.

Texas is approximately 678,052 sq km, while South Dakota is approximately 196,540 sq km, making South Dakota 28.99% the size of Texas. Meanwhile, the population of Texas is ~25.1 million people (24.3 million fewer people live in South Dakota).
This to-scale comparison of Texas vs. South Dakota uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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