Vermont is about 16 times smaller than Montana.

Montana is approximately 376,979 sq km, while Vermont is approximately 23,956 sq km, making Vermont 6.35% the size of Montana. Meanwhile, the population of Montana is ~989,415 people (363,674 fewer people live in Vermont).
Tip: This to-scale comparison of Montana vs. Vermont uses the Mercator projection, which distorts the size of regions near the poles.