City size comparison

compared to

San Francisco is about 28 times smaller than Hanoi.

Hanoi is approximately 3,360 sq km, while San Francisco (including the city proper only) is approximately 121 sq km, making San Francisco 3.6% the size of Hanoi.
Tip: This to-scale comparison of Hanoi 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. Hanoi

Flip Comparison · See true size
See San Francisco on top of Hanoi
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Cost of Living Comparison · 7 categories - 2026 data
Hanoi is 77.0% cheaper than San Francisco
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