Wisconsin is about 1.3 times bigger than Ohio.

Ohio is approximately 106,056 sq km, while Wisconsin is approximately 140,663 sq km, making Wisconsin 33% larger than Ohio. Meanwhile, the population of Ohio is ~11.5 million people (5.8 million fewer people live in Wisconsin).
This to-scale comparison of Ohio vs. Wisconsin uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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