Iowa is about 1.4 times smaller than South Dakota.

South Dakota is approximately 196,540 sq km, while Iowa is approximately 144,701 sq km, making Iowa 73.62% the size of South Dakota. Meanwhile, the population of South Dakota is ~814,180 people (2.2 million more people live in Iowa).
This to-scale comparison of South Dakota vs. Iowa uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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