Boise is about 1.6 times bigger than Fargo.

Fargo (map shows its 38 named neighbourhoods; the area covers the whole city) is approximately 133 sq km, while Boise is approximately 221 sq km, making Boise 65% larger than Fargo.
Tip: This to-scale comparison of Fargo vs. Boise 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.