City size comparison

compared to

Chicago is about 19 times bigger than San Mateo.

San Mateo is approximately 31 sq km, while Chicago is approximately 590 sq km, making Chicago 1,777% larger than San Mateo.
Tip: This to-scale comparison of San Mateo vs. Chicago uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Chicago vs. San Mateo

Flip Comparison · See true size
See Chicago on top of San Mateo
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Cost of Living Comparison · 7 categories - 2026 data
San Mateo is 9.8% more expensive than Chicago
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