City size comparison

compared to

Boston is about 3.3 times smaller than Cologne.

Cologne is approximately 405 sq km, while Boston is approximately 124 sq km, making Boston 30.62% the size of Cologne.
Tip: This to-scale comparison of Cologne vs. Boston uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Boston vs. Cologne

Flip Comparison · See true size
See Boston on top of Cologne
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Cost of Living Comparison · 7 categories - 2026 data
Cologne is 11.9% cheaper than Boston
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