City size comparison

compared to

San Mateo is about 4 times smaller than Boston.

Boston is approximately 124 sq km, while San Mateo is approximately 31 sq km, making San Mateo 25.34% the size of Boston.
Tip: This to-scale comparison of Boston 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. Boston

Flip Comparison · See true size
See San Mateo on top of Boston
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Cost of Living Comparison · 7 categories - 2026 data
Boston is 8.0% more expensive than San Mateo
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