City size comparison

compared to

London is about 50 times bigger than San Mateo.

San Mateo is approximately 31 sq km, while London (including the 32 boroughs of greater London) is approximately 1,572 sq km, making London 4,902% larger than San Mateo.
Tip: This to-scale comparison of San Mateo vs. London uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: London vs. San Mateo

Flip Comparison · See true size
See London on top of San Mateo
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Cost of Living Comparison · 7 categories - 2026 data
San Mateo is 6.2% more expensive than London
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