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Vietnam
Australia
Area Comparison
Hanoi is 3.7x smaller than Sydney
Population Comparison
Hanoi has 1.5x more people than Sydney
Yes — Sydney is 3.7x larger than Hanoi by area. Sydney spans 12,368 km² (4,775 mi²) while Hanoi covers 3,359 km² (1,297 mi²) — a difference of 9,009 km². You could fit Hanoi inside Sydney approximately 3 times.
To put Hanoi's size in perspective, its area of 3,359 km² is about 1.2x smaller than Rhode Island. Meanwhile, Sydney at 12,368 km² is about 2.0x the size of Shanghai.
Vietnam's capital with over a thousand years of history. Known as "The City of the Ascending Dragon", Hanoi covers 3,359 km² with a population of 8.1 million. The city was established in 1010. Hanoi is known for Hoàn Kiếm Lake, Old Quarter (36 Streets), Ho Chi Minh Mausoleum, among other attractions. The city's main transit system is the Hanoi Metro.
Hanoi's Old Quarter has been a trading hub for nearly 1,000 years, with each street historically dedicated to a specific trade
Australia's largest city, known for the Opera House. Nicknamed "The Harbour City", Sydney has an area of 12,368 km² and is home to 5.3 million people. Its history stretches 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 3.7x larger than greater Hanoi at 3,359 km². The Hanoi metro area is also more populous, with 8.1 million people compared to 5.3 million.
Hanoi has a population density of 2,397 people per km² — a moderately dense city. Sydney, with 429 people per km², is a low-density, sprawling urban area. Hanoi is dramatically more crowded, with 5.6x the population density.
This comparison spans continents — Hanoi in Asia versus Sydney in Oceania. Despite the geographic distance, comparing their sizes reveals surprising insights about how cities grow worldwide.
Both cities share a humid subtropical climate, though local geography creates distinct microclimates in each. When it's noon in Sydney, it's 9:00 AM in Hanoi — a 3-hour time difference.
Size Ratio
Hanoi fits inside Sydney ~3 times
Density Gap
Hanoi is 5.6x more densely populated
Time Difference
3 hours apart
History
Hanoi is ~778 years older
The straight-line distance from Hanoi to Sydney is 7,767 km (4,826 miles), with an estimated flight time of ~9h 38m. See full distance details, including timezone difference and city facts.
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