Idaho is about 1.5 times bigger than Wisconsin.

Wisconsin is approximately 140,663 sq km, while Idaho is approximately 214,314 sq km, making Idaho 52% larger than Wisconsin. Meanwhile, the population of Wisconsin is ~6.0 million people (3.9 million fewer people live in Idaho).
Tip: This to-scale comparison of Wisconsin vs. Idaho uses the Mercator projection, which distorts the size of regions near the poles.
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