Philadelphia is about 1.6 times smaller than Columbus.

Columbus is approximately 574 sq km, while Philadelphia is approximately 348 sq km, making Philadelphia 60.63% the size of Columbus.
Tip: This to-scale comparison of Columbus 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.