Boise is about 4.6 times bigger than Providence.

Providence is approximately 48 sq km, while Boise is approximately 221 sq km, making Boise 363% larger than Providence.
Tip: This to-scale comparison of Providence 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.