City size comparison

compared to

San Mateo is about 1.2 times bigger than Sydney.

Sydney is approximately 27 sq km, while San Mateo is approximately 31 sq km, making San Mateo 18% larger than Sydney.
Tip: This to-scale comparison of Sydney 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. Sydney

Flip Comparison · See true size
See San Mateo on top of Sydney
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Cost of Living Comparison · 7 categories - 2026 data
Sydney is 2.7% more expensive than San Mateo
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