Dublin is about 8 times bigger than Cocos (Keeling) Islands.

Cocos (Keeling) Islands is approximately 14 sq km, while Dublin is approximately 118 sq km, making Dublin 741% larger than Cocos (Keeling) Islands.
Tip: This to-scale comparison of Cocos (Keeling) Islands vs. Dublin uses the Mercator projection, which distorts the size of regions near the poles.