Colorado Springs is about 4.2 times bigger than Boston.

Boston is approximately 124 sq km, while Colorado Springs (map shows its 11 named neighbourhoods; the area covers the whole city) is approximately 523 sq km, making Colorado Springs 322% larger than Boston.
Tip: This to-scale comparison of Boston vs. Colorado Springs 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.