Guam is about 129 times smaller than Ireland.

Ireland is approximately 70,273 sq km, while Guam is approximately 544 sq km, making Guam 0.77% the size of Ireland. Meanwhile, the population of Ireland is ~5.3 million people (5.1 million fewer people live in Guam).
This to-scale comparison of Ireland vs. Guam uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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