City size comparison

compared to

Cologne is about 3.3 times bigger than Boston.

Boston is approximately 124 sq km, while Cologne is approximately 405 sq km, making Cologne 227% larger than Boston.
Tip: This to-scale comparison of Boston vs. Cologne uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Cologne vs. Boston

Flip Comparison · See true size
See Cologne on top of Boston
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Cost of Living Comparison · 7 categories - 2026 data
Boston is 49.1% more expensive than Cologne
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