Cocos (Keeling) Islands is about 19 times smaller than Niue.

Niue is approximately 260 sq km, while Cocos (Keeling) Islands is approximately 14 sq km, making Cocos (Keeling) Islands 5.38% the size of Niue. Meanwhile, the population of Niue is ~1,933 people (1,331 fewer people live in Cocos (Keeling) Islands).
Tip: This to-scale comparison of Niue vs. Cocos (Keeling) Islands 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.