Montana is about 1.5 times smaller than France.

France is approximately 551,500 sq km, while Montana is approximately 376,979 sq km, making Montana 68.36% the size of France. Meanwhile, the population of France is ~68.3 million people (67.3 million fewer people live in Montana).
This to-scale comparison of France vs. Montana uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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