Montana is about 21 times smaller than Australia.

Australia is approximately 7,741,220 sq km, while Montana is approximately 376,979 sq km, making Montana 4.87% the size of Australia. Meanwhile, the population of Australia is ~26.1 million people (25.2 million fewer people live in Montana).
This to-scale comparison of Australia vs. Montana uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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