San Mateo is about 1.2 times bigger than Charlottesville.

Charlottesville is approximately 27 sq km, while San Mateo is approximately 31 sq km, making San Mateo 18% larger than Charlottesville.
Tip: This to-scale comparison of Charlottesville vs. San Mateo uses the Mercator projection, which distorts the size of regions near the poles.
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