West Virginia is about 2.9 times smaller than North Dakota.

North Dakota is approximately 178,647 sq km, while West Virginia is approximately 62,361 sq km, making West Virginia 34.91% the size of North Dakota. Meanwhile, the population of North Dakota is ~672,591 people (1.2 million more people live in West Virginia).
Tip: This to-scale comparison of North Dakota vs. West Virginia uses the Mercator projection, which distorts the size of regions near the poles.