Guam is about 9 times bigger than San Marino.

San Marino is approximately 61 sq km, while Guam is approximately 544 sq km, making Guam 792% larger than San Marino. Meanwhile, the population of San Marino is ~34,682 people (134,404 more people live in Guam).
This to-scale comparison of San Marino vs. Guam uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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