City size comparison

compared to

Boston is about 4.6 times bigger than Sydney.

Sydney is approximately 27 sq km, while Boston is approximately 124 sq km, making Boston 364% larger than Sydney.
Tip: This to-scale comparison of Sydney vs. Boston uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Boston vs. Sydney
Flip Comparison · See true size
See Boston on top of Sydney
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Cost of Living Comparison · 7 categories - 2026 data
Sydney is 7.8% cheaper than Boston
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