City size comparison

compared to

San Francisco is about 1.5 times smaller than Porirua.

Porirua is approximately 182 sq km, while San Francisco (including the city proper only) is approximately 121 sq km, making San Francisco 66.34% the size of Porirua.
Tip: This to-scale comparison of Porirua vs. San Francisco uses the Mercator projection, which distorts the size of regions near the poles.
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