Phoenix is about 38 times smaller than Costa Rica.

Costa Rica is approximately 51,100 sq km, while Phoenix is approximately 1,342 sq km, making Phoenix 2.63% the size of Costa Rica.
Tip: This to-scale comparison of Costa Rica vs. Phoenix 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.