Mexico is about 9 times bigger than Idaho.

Idaho is approximately 214,314 sq km, while Mexico is approximately 1,964,375 sq km, making Mexico 817% larger than Idaho. Meanwhile, the population of Idaho is ~1.6 million people (127.6 million more people live in Mexico).
Tip: This to-scale comparison of Idaho vs. Mexico uses the Mercator projection, which distorts the size of regions near the poles.