Fargo is about 2.6 times smaller than Portland.

Portland is approximately 346 sq km, while Fargo (map shows its 38 named neighbourhoods; the area covers the whole city) is approximately 133 sq km, making Fargo 38.57% the size of Portland.
Tip: This to-scale comparison of Portland vs. Fargo uses the Mercator projection, which distorts the size of regions near the poles.
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