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USA
Australia
Area Comparison
Boston is 53.3x smaller than Sydney
Population Comparison
Boston has 7.8x fewer people than Sydney
Sydney is significantly larger, covering 53.3 times the area of Boston. Sydney spans 12,368 km² (4,775 mi²) while Boston covers 232 km² (90 mi²) — a difference of 12,136 km². You could fit Boston inside Sydney approximately 53 times.
To put Boston's size in perspective, its area of 232 km² is roughly the same size as Amsterdam. Meanwhile, Sydney at 12,368 km² is about 2.0x the size of Shanghai.
A historic city and academic center in the northeastern US. Known as "Beantown", Boston covers 232 km² with a population of 0.7 million. The city was established in 1630. Boston is known for Harvard & MIT, Freedom Trail, Fenway Park, among other attractions. The city's main transit system is the MBTA (The T).
Boston's subway system (the T) opened in 1897, making it the oldest subway in North America
Australia's largest city, known for the Opera House. Also known as "The Harbour City", Sydney has an area of 12,368 km² and is home to 5.3 million people. The city dates back to 1788. Visitors come for Sydney Opera House, Harbour Bridge, Bondi Beach, and much more. Getting around is easy with the Sydney Trains.
Sydney's administrative area is so large it stretches from the coast to the Blue Mountains foothills
Looking beyond city limits, the Sydney metropolitan area covers 12,368 km², which is 1.1x larger than greater Boston at 11,700 km². The Sydney metro area is also more populous, with 5.3 million people compared to 4.9 million.
Boston has a population density of 2,931 people per km² — a moderately dense city. Sydney, with 429 people per km², is a low-density, sprawling urban area. Boston is dramatically more crowded, with 6.8x the population density.
This comparison spans continents — Boston in North America versus Sydney in Oceania. Despite the geographic distance, comparing their sizes reveals surprising insights about how cities grow worldwide.
Boston has a humid continental climate while Sydney experiences humid subtropical conditions. When it's noon in Sydney, it's midnight in Boston — a 15-hour time difference.
Size Ratio
Boston fits inside Sydney ~53 times
Density Gap
Boston is 6.8x more densely populated
Time Difference
15 hours apart
History
Boston is ~158 years older
The straight-line distance from Boston to Sydney is 16,240 km (10,091 miles), with an estimated flight time of ~19h 36m. See full distance details, including timezone difference and city facts.
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