North Dakota is around the same size as South Dakota.

South Dakota is approximately 196,540 sq km, while North Dakota is approximately 178,647 sq km, making North Dakota 90.9% the size of South Dakota. Meanwhile, the population of South Dakota is ~814,180 people (141,589 fewer people live in North Dakota).
Tip: This to-scale comparison of South Dakota vs. North Dakota uses the Mercator projection, which distorts the size of regions near the poles.
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