Turkey is about 2.1 times bigger than Montana.

Montana is approximately 376,979 sq km, while Turkey is approximately 783,562 sq km, making Turkey 108% larger than Montana. Meanwhile, the population of Montana is ~989,415 people (82.1 million more people live in Turkey).
Tip: This to-scale comparison of Montana vs. Turkey uses the Mercator projection, which distorts the size of regions near the poles.