City size comparison

compared to

Boston is about 4 times bigger than San Mateo.

San Mateo is approximately 31 sq km, while Boston is approximately 124 sq km, making Boston 295% larger than San Mateo.
Tip: This to-scale comparison of San Mateo vs. Boston uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Boston vs. San Mateo

Flip Comparison · See true size
See Boston on top of San Mateo
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Cost of Living Comparison · 7 categories - 2026 data
San Mateo is 1.4% more expensive than Boston
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