Costa Rica is about 1.2 times smaller than West Virginia.

West Virginia is approximately 62,361 sq km, while Costa Rica is approximately 51,100 sq km, making Costa Rica 81.94% the size of West Virginia. Meanwhile, the population of West Virginia is ~1.9 million people (3.4 million more people live in Costa Rica).
Tip: This to-scale comparison of West Virginia vs. Costa Rica uses the Mercator projection, which distorts the size of regions near the poles.