Mexico is about 8 times bigger than Wyoming.

Wyoming is approximately 251,489 sq km, while Mexico is approximately 1,964,375 sq km, making Mexico 681% larger than Wyoming. Meanwhile, the population of Wyoming is ~563,626 people (128.6 million more people live in Mexico).
Tip: This to-scale comparison of Wyoming vs. Mexico uses the Mercator projection, which distorts the size of regions near the poles.