City size comparison

compared to

Hanoi is about 28 times bigger than San Francisco.

San Francisco (including the city proper only) is approximately 121 sq km, while Hanoi is approximately 3,360 sq km, making Hanoi 2,677% larger than San Francisco.
Tip: This to-scale comparison of San Francisco vs. Hanoi uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Hanoi vs. San Francisco

Flip Comparison · See true size
See Hanoi on top of San Francisco
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Cost of Living Comparison · 7 categories - 2026 data
San Francisco is 4.3 times more expensive than Hanoi
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