Madison is about 6 times smaller than Phoenix.

Phoenix is approximately 1,342 sq km, while Madison (map shows its 124 named neighbourhoods; the area covers the whole city) is approximately 217 sq km, making Madison 16.13% the size of Phoenix.
Tip: This to-scale comparison of Phoenix vs. Madison 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.