Massachusetts is about 432 times bigger than Pitcairn Islands.

Pitcairn Islands is approximately 47 sq km, while Massachusetts is approximately 20,306 sq km, making Massachusetts 43,104% larger than Pitcairn Islands. Meanwhile, the population of Pitcairn Islands is ~50 people (6.5 million more people live in Massachusetts).
Tip: This to-scale comparison of Pitcairn Islands vs. Massachusetts uses the Mercator projection, which distorts the size of regions near the poles.