Milwaukee is about 2.4 times smaller than Seoul.

Seoul is approximately 605 sq km, while Milwaukee is approximately 249 sq km, making Milwaukee 41.15% the size of Seoul.
Tip: This to-scale comparison of Seoul vs. Milwaukee 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.