Atlanta is about 766 times smaller than Colorado.

Colorado is approximately 268,627 sq km, while Atlanta (map shows its 114 named neighbourhoods; the area covers the whole city) is approximately 350 sq km, making Atlanta 0.13% the size of Colorado.
Tip: This to-scale comparison of Colorado vs. Atlanta 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.