Tajikistan is about 2.6 times smaller than Montana.

Montana is approximately 376,979 sq km, while Tajikistan is approximately 144,100 sq km, making Tajikistan 38.22% the size of Montana. Meanwhile, the population of Montana is ~989,415 people (8.1 million more people live in Tajikistan).
Tip: This to-scale comparison of Montana vs. Tajikistan uses the Mercator projection, which distorts the size of regions near the poles.
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