Montana is about 3.4 times smaller than Peru.

Peru is approximately 1,285,216 sq km, while Montana is approximately 376,979 sq km, making Montana 29.33% the size of Peru. Meanwhile, the population of Peru is ~32.3 million people (31.3 million fewer people live in Montana).
This to-scale comparison of Peru vs. Montana uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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