City size comparison

compared to

Warsaw is about 16 times bigger than San Mateo.

San Mateo is approximately 31 sq km, while Warsaw is approximately 517 sq km, making Warsaw 1,546% larger than San Mateo.
Tip: This to-scale comparison of San Mateo vs. Warsaw uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Warsaw vs. San Mateo

Flip Comparison · See true size
See Warsaw on top of San Mateo
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Cost of Living Comparison · 7 categories - 2026 data
San Mateo is 2.0 times more expensive than Warsaw
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