Oakland is about 14 times bigger than Cocos (Keeling) Islands.

Cocos (Keeling) Islands is approximately 14 sq km, while Oakland is approximately 202 sq km, making Oakland 1,343% larger than Cocos (Keeling) Islands.
Tip: This to-scale comparison of Cocos (Keeling) Islands vs. Oakland uses the Mercator projection, which distorts the size of regions near the poles.