City size comparison

compared to

San Diego is about 7 times bigger than Boston.

Boston is approximately 124 sq km, while San Diego is approximately 844 sq km, making San Diego 581% larger than Boston.
Tip: This to-scale comparison of Boston vs. San Diego uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: San Diego vs. Boston
Flip Comparison · See true size
See San Diego on top of Boston
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Cost of Living Comparison · 7 categories - 2026 data
Boston is 6.8% more expensive than San Diego
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