Des Moines is around the same size as Buenos Aires.

Buenos Aires is approximately 203 sq km, while Des Moines (map shows its 58 named neighbourhoods; the area covers the whole city) is approximately 228 sq km, making Des Moines 12% larger than Buenos Aires.
Tip: This to-scale comparison of Buenos Aires vs. Des Moines 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.