Idaho is about 9 times smaller than Mexico.

Mexico is approximately 1,964,375 sq km, while Idaho is approximately 214,314 sq km, making Idaho 10.91% the size of Mexico. Meanwhile, the population of Mexico is ~129.2 million people (127.6 million fewer people live in Idaho).
Tip: This to-scale comparison of Mexico vs. Idaho uses the Mercator projection, which distorts the size of regions near the poles.