City size comparison

compared to

Madrid is about 4.9 times bigger than Boston.

Boston is approximately 124 sq km, while Madrid is approximately 604 sq km, making Madrid 387% larger than Boston.
Tip: This to-scale comparison of Boston vs. Madrid uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Madrid vs. Boston
Flip Comparison · See true size
See Madrid on top of Boston
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Cost of Living Comparison · 7 categories - 2026 data
Boston is 68.0% more expensive than Madrid
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