New Mexico is about 5 times smaller than Iran.

Iran is approximately 1,648,195 sq km, while New Mexico is approximately 314,310 sq km, making New Mexico 19.07% the size of Iran. Meanwhile, the population of Iran is ~86.8 million people (84.7 million fewer people live in New Mexico).
Tip: This to-scale comparison of Iran vs. New Mexico uses the Mercator projection, which distorts the size of regions near the poles.