Maine is about 2.7 times smaller than Idaho.

Idaho is approximately 214,314 sq km, while Maine is approximately 79,931 sq km, making Maine 37.3% the size of Idaho. Meanwhile, the population of Idaho is ~1.6 million people (239,221 fewer people live in Maine).
Tip: This to-scale comparison of Idaho vs. Maine uses the Mercator projection, which distorts the size of regions near the poles.