Baltimore is about 6 times smaller than Phoenix.

Phoenix is approximately 1,342 sq km, while Baltimore is approximately 210 sq km, making Baltimore 15.62% the size of Phoenix.
Tip: This to-scale comparison of Phoenix vs. Baltimore 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.