Delaware is about 42 times smaller than Idaho.

Idaho is approximately 214,314 sq km, while Delaware is approximately 5,060 sq km, making Delaware 2.36% the size of Idaho. Meanwhile, the population of Idaho is ~1.6 million people (669,648 fewer people live in Delaware).
Tip: This to-scale comparison of Idaho vs. Delaware uses the Mercator projection, which distorts the size of regions near the poles.