San Marino is about 1.3 times smaller than Guernsey.

Guernsey is approximately 78 sq km, while San Marino is approximately 61 sq km, making San Marino 78.21% the size of Guernsey. Meanwhile, the population of Guernsey is ~67,491 people (32,809 fewer people live in San Marino).
This to-scale comparison of Guernsey vs. San Marino uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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