Cambodia is about 1.2 times smaller than Idaho.

Idaho is approximately 214,314 sq km, while Cambodia is approximately 181,035 sq km, making Cambodia 84.47% the size of Idaho. Meanwhile, the population of Idaho is ~1.6 million people (15.1 million more people live in Cambodia).
Tip: This to-scale comparison of Idaho vs. Cambodia uses the Mercator projection, which distorts the size of regions near the poles.