Austin is about 59 times bigger than Cocos (Keeling) Islands.

Cocos (Keeling) Islands is approximately 14 sq km, while Austin is approximately 829 sq km, making Austin 5,819% larger than Cocos (Keeling) Islands.
Tip: This to-scale comparison of Cocos (Keeling) Islands vs. Austin uses the Mercator projection, which distorts the size of regions near the poles.