Montana is about 7 times smaller than Argentina.

Argentina is approximately 2,780,400 sq km, while Montana is approximately 376,979 sq km, making Montana 13.56% the size of Argentina. Meanwhile, the population of Argentina is ~46.2 million people (45.3 million fewer people live in Montana).
Tip: This to-scale comparison of Argentina vs. Montana uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.