City size comparison

compared to

San Mateo is about 3.9 times smaller than San Francisco.

San Francisco (including the city proper only) is approximately 121 sq km, while San Mateo is approximately 31 sq km, making San Mateo 25.97% the size of San Francisco.
Tip: This to-scale comparison of San Francisco vs. San Mateo uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: San Mateo vs. San Francisco

Flip Comparison · See true size
See San Mateo on top of San Francisco
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Cost of Living Comparison · 7 categories - 2026 data
San Francisco is 19.1% more expensive than San Mateo
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