City size comparison

compared to

Sydney is about 1.2 times smaller than San Mateo.

San Mateo is approximately 31 sq km, while Sydney is approximately 27 sq km, making Sydney 84.96% the size of San Mateo.
Tip: This to-scale comparison of San Mateo vs. Sydney uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Sydney vs. San Mateo

Flip Comparison · See true size
See Sydney on top of San Mateo
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Cost of Living Comparison · 7 categories - 2026 data
San Mateo is 26.8% more expensive than Sydney
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