South Dakota is about 1.4 times bigger than Iowa.

Iowa is approximately 144,701 sq km, while South Dakota is approximately 196,540 sq km, making South Dakota 36% larger than Iowa. Meanwhile, the population of Iowa is ~3.0 million people (2.2 million fewer people live in South Dakota).
This to-scale comparison of Iowa vs. South Dakota uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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