City size comparison

compared to

San Francisco is about 3.4 times smaller than Cologne.

Cologne is approximately 405 sq km, while San Francisco (including the city proper only) is approximately 121 sq km, making San Francisco 29.88% the size of Cologne.
Tip: This to-scale comparison of Cologne vs. San Francisco uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: San Francisco vs. Cologne

Flip Comparison · See true size
See San Francisco on top of Cologne
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Cost of Living Comparison · 7 categories - 2026 data
Cologne is 22.5% cheaper than San Francisco
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