French Polynesia is about 4.9 times smaller than Massachusetts.

Massachusetts is approximately 20,306 sq km, while French Polynesia is approximately 4,167 sq km, making French Polynesia 20.52% the size of Massachusetts. Meanwhile, the population of Massachusetts is ~6.5 million people (6.2 million fewer people live in French Polynesia).
Tip: This to-scale comparison of Massachusetts vs. French Polynesia uses the Mercator projection, which distorts the size of regions near the poles.