Philadelphia is about 1.7 times smaller than Madrid.

Madrid is approximately 604 sq km, while Philadelphia is approximately 348 sq km, making Philadelphia 57.57% the size of Madrid.
Tip: This to-scale comparison of Madrid vs. Philadelphia 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.