Buenos Aires is about 1.2 times smaller than Milwaukee.

Milwaukee is approximately 249 sq km, while Buenos Aires is approximately 203 sq km, making Buenos Aires 81.62% the size of Milwaukee.
Tip: This to-scale comparison of Milwaukee vs. Buenos Aires 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.