City size comparison

compared to

Seattle is about 7 times bigger than San Mateo.

San Mateo is approximately 31 sq km, while Seattle is approximately 217 sq km, making Seattle 591% larger than San Mateo.
Tip: This to-scale comparison of San Mateo vs. Seattle uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Seattle vs. San Mateo

Flip Comparison · See true size
See Seattle on top of San Mateo
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Cost of Living Comparison · 7 categories - 2026 data
San Mateo is 0.9% cheaper than Seattle
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