City size comparison

compared to

Sydney is about 31 times bigger than Boston.

Boston is approximately 124 sq km, while Sydney (the 30 councils of metropolitan Sydney, without the Blue Mountains, Hawkesbury, Wollondilly and the Central Coast) is approximately 3,810 sq km, making Sydney 2,972% larger than Boston.
Tip: This to-scale comparison of Boston vs. Sydney uses the Mercator projection, which distorts the size of regions near the poles.
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Compare further: Sydney vs. Boston

Flip Comparison · See true size
See Sydney on top of Boston
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Cost of Living Comparison · 7 categories - 2026 data
Boston is 19.6% more expensive than Sydney
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