Country size comparison

compared to

San Diego is about 422 times bigger than Monaco.

Monaco is approximately 2 sq km, while San Diego is approximately 844 sq km, making San Diego 42,101% larger than Monaco.
Tip: This to-scale comparison of Monaco vs. San Diego uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: San Diego vs. Monaco
Flip Comparison · See true size
See San Diego on top of Monaco
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Cost of Living Comparison · 7 categories - 2026 data
Monaco is 89.9% more expensive than San Diego
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