West Virginia is about 6 times smaller than Montana.

Montana is approximately 376,979 sq km, while West Virginia is approximately 62,361 sq km, making West Virginia 16.54% the size of Montana. Meanwhile, the population of Montana is ~989,415 people (863,579 more people live in West Virginia).
Tip: This to-scale comparison of Montana vs. West Virginia uses the Mercator projection, which distorts the size of regions near the poles.