Massachusetts is about 15 times bigger than Phoenix.

Phoenix is approximately 1,342 sq km, while Massachusetts is approximately 20,306 sq km, making Massachusetts 1,413% larger than Phoenix.
Tip: This to-scale comparison of Phoenix vs. Massachusetts uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.