French Polynesia is about 51 times smaller than Idaho.

Idaho is approximately 214,314 sq km, while French Polynesia is approximately 4,167 sq km, making French Polynesia 1.94% the size of Idaho. Meanwhile, the population of Idaho is ~1.6 million people (1.3 million fewer people live in French Polynesia).
Tip: This to-scale comparison of Idaho vs. French Polynesia uses the Mercator projection, which distorts the size of regions near the poles.