Oman is about 2.2 times bigger than Wisconsin.

Wisconsin is approximately 140,663 sq km, while Oman is approximately 309,500 sq km, making Oman 120% larger than Wisconsin. Meanwhile, the population of Wisconsin is ~5.7 million people (1.9 million fewer people live in Oman).
This to-scale comparison of Wisconsin vs. Oman uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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