Des Moines is about 1.7 times bigger than Fargo.

Fargo (map shows its 38 named neighbourhoods; the area covers the whole city) is approximately 133 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 71% larger than Fargo.
Tip: This to-scale comparison of Fargo vs. Des Moines uses the Mercator projection, which distorts the size of regions near the poles.
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