Macau is about 19 times smaller than Guam.

Guam is approximately 544 sq km, while Macau is approximately 28 sq km, making Macau 5.18% the size of Guam. Meanwhile, the population of Guam is ~169,086 people (466,207 more people live in Macau).
This to-scale comparison of Guam vs. Macau uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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