Boise is around the same size as Osaka.

Osaka is approximately 223 sq km, while Boise is approximately 221 sq km, making Boise 98.9% the size of Osaka.
Tip: This to-scale comparison of Osaka 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.