Sacramento is about 18 times bigger than Cocos (Keeling) Islands.

Cocos (Keeling) Islands is approximately 14 sq km, while Sacramento is approximately 253 sq km, making Sacramento 1,707% larger than Cocos (Keeling) Islands.
Tip: This to-scale comparison of Cocos (Keeling) Islands vs. Sacramento uses the Mercator projection, which distorts the size of regions near the poles.