City size comparison

compared to

San Mateo is about 7 times smaller than Seattle.

Seattle is approximately 217 sq km, while San Mateo is approximately 31 sq km, making San Mateo 14.46% the size of Seattle.
Tip: This to-scale comparison of Seattle 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. Seattle

Flip Comparison · See true size
See San Mateo on top of Seattle
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Cost of Living Comparison · 7 categories - 2026 data
Seattle is 10.8% more expensive than San Mateo
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