Hanoi
3,359 km²
Tehran
730 km²
Vietnam
Iran
Area Comparison
Hanoi is 4.6x larger than Tehran
Population Comparison
Hanoi has 1.1x fewer people than Tehran
In terms of area, Hanoi is 4.6x the size of Tehran. Hanoi spans 3,359 km² (1,297 mi²) while Tehran covers 730 km² (282 mi²) — a difference of 2,629 km². You could fit Tehran inside Hanoi approximately 4 times.
To put Hanoi's size in perspective, its area of 3,359 km² is about 1.2x smaller than Rhode Island. Meanwhile, Tehran at 730 km² is roughly the same size as New York City.
Hanoi's footprint is roughly about 470,000 American football fields, 57 times the area of Manhattan, or 32 times the area of Paris — pick whichever unit feels intuitive. For Tehran, that's about 102,000 American football fields, 12 times the area of Manhattan, or 7 times the area of Paris.
Hanoi is the capital and second-most populous municipality of Vietnam. It encompasses an area of 3,358.6 km2 (1,296.8 mi2), and as of 2025 has a population of 8,807,523. Hanoi had the second-highest gross regional domestic product of all Vietnamese provinces and municipalities at US$48 billion in 2023, behind Ho Chi Minh City. It hosts 78 foreign embassies, the headquarters of the Vietnam People's Army (VPA), its Vietnam National University system, and other governmental organizations.
Known as "City Between Rivers", Hanoi covers 3,359 km² with a population of 8.1 million. The city was established in 1010. Hanoi is known for Hoan Kiem Lake, Old Quarter, Temple of Literature, among other attractions. The city's main transit system is the Hanoi Metro.
Hanoi encompasses 3,358.6 square kilometers and had a population of nearly 8.8 million as of 2025.
Tehran is the capital and largest city of Iran. It is also the capital of Tehran province and the administrative center for Tehran County and its Central District. With a population of around 9 million in the city, and 16.8 million in the metropolitan area, Tehran is the most populous city in Iran and West Asia, the second-largest metropolitan area in the Middle East after Cairo, and the 24th-most-populous metropolitan area in the world.
Tehran has an area of 730 km² and is home to 9.1 million people. The city dates back to 1524. Visitors come for Azadi Tower, Milad Tower, Golestan Palace, and much more. Getting around is easy with the Tehran Metro.
Tehran's metropolitan area holds 16.8 million people, making it the second-largest metropolitan area in the Middle East after Cairo.
Looking beyond city limits, the Hanoi metropolitan area covers 3,359 km², which is 1.5x larger than greater Tehran at 2,235 km². The Tehran metro area is also more populous, with 16.0 million people compared to 8.1 million.
Hanoi has a population density of 2,397 people per km² — a moderately dense city. Tehran, with 12,507 people per km², is an extremely dense urban environment. Tehran is dramatically more crowded, with 5.2x the population density.
Both cities are in Asia, but they represent different national approaches to urban development. Hanoi (Vietnam) and Tehran (Iran) offer a fascinating regional contrast.
Hanoi has a humid subtropical climate while Tehran experiences hot-summer Mediterranean conditions. When it's noon in Hanoi, it's 8.5:00 AM in Tehran — a 3.5-hour time difference.
Size Ratio
Tehran fits inside Hanoi ~4 times
Density Gap
Tehran is 5.2x more densely populated
Time Difference
3.5 hours apart
History
Hanoi is ~514 years older
Hanoi covers 3,359 km². Cities with a similar urban footprint include Karachi (3,527 km²), Cairo (3,085 km²), Dubai (4,114 km²), Lima (2,672 km²), or Moscow (2,511 km²).
Tehran covers 730 km². Cities with a similar urban footprint include Singapore (733 km²), Bangalore (741 km²), Hamburg (755 km²), Nairobi (696 km²), or New York (783 km²).
The straight-line distance from Hanoi to Tehran is 5,498 km (3,416 miles), with an estimated flight time of ~6h 58m.
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