Guam is about 1.3 times bigger than Barbados.

Barbados is approximately 430 sq km, while Guam is approximately 544 sq km, making Guam 27% larger than Barbados. Meanwhile, the population of Barbados is ~282,623 people (113,624 fewer people live in Guam).
Tip: This to-scale comparison of Barbados vs. Guam uses the Mercator projection, which distorts the size of regions near the poles.
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