Boston
232 km²
Hanoi
3,359 km²
USA
Vietnam
Area Comparison
Boston is 14.5x smaller than Hanoi
Population Comparison
Boston has 11.8x fewer people than Hanoi
Yes — Hanoi is 14.5x larger than Boston by area. Hanoi spans 3,359 km² (1,297 mi²) while Boston covers 232 km² (90 mi²) — a difference of 3,127 km². You could fit Boston inside Hanoi approximately 14 times.
To put Boston's size in perspective, its area of 232 km² is roughly the same size as Amsterdam. Meanwhile, Hanoi at 3,359 km² is about 1.2x smaller than Rhode Island.
Picture Boston another way: its area is large enough to fit about 32,000 American football fields, 110 times the area of Monaco, or 68 times the area of Central Park. Hanoi works out to about 470,000 American football fields, 57 times the area of Manhattan, or 32 times the area of Paris.
Boston is the capital and most populous city of the U.S. state of Massachusetts. It serves as a cultural and financial center of New England, a region of the Northeastern United States. Boston has an area of 48.4 sq mi (125 km2) and a population of 675,647 as of the 2020 census, making it the third-most populous city in the Northeastern United States after New York City and Philadelphia.
Known as "Beantown", Boston covers 232 km² with a population of 0.7 million. The city was established in 1630. Boston is known for Fenway Park, Freedom Trail, Harvard University, among other attractions. The city's main transit system is the MBTA (The T).
Boston covers just 125 km2 yet serves as the cultural and financial heart of all New England
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.
Nicknamed "City Between Rivers", Hanoi has an area of 3,359 km² and is home to 8.1 million people. Its history stretches back to 1010. Visitors come for Hoan Kiem Lake, Old Quarter, Temple of Literature, and much more. Getting around is easy with the Hanoi Metro.
Hanoi encompasses 3,358.6 square kilometers and had a population of nearly 8.8 million as of 2025.
Looking beyond city limits, the Boston metropolitan area covers 11,700 km², which is 3.5x larger than greater Hanoi at 3,359 km². The Hanoi metro area is also more populous, with 8.1 million people compared to 4.9 million.
Boston has a population density of 2,931 people per km² — a moderately dense city. Hanoi, with 2,397 people per km², is a moderately dense city. Both cities have comparable density, though Boston is slightly more compact.
This comparison spans continents — Boston in North America versus Hanoi in Asia. Despite the geographic distance, comparing their sizes reveals surprising insights about how cities grow worldwide.
Boston has a humid continental climate while Hanoi experiences humid subtropical conditions. Winters differ dramatically: Hanoi stays around 17°C while Boston drops to -1°C. When it's noon in Hanoi, it's midnight in Boston — a 12-hour time difference.
Size Ratio
Boston fits inside Hanoi ~14 times
Time Difference
12 hours apart
History
Hanoi is ~620 years older
Boston covers 232 km². Cities with a similar urban footprint include Osaka (225 km²), Kuala Lumpur (243 km²), Amsterdam (219 km²), Helsinki (214 km²), or Edinburgh (259 km²).
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).
The straight-line distance from Boston to Hanoi is 12,959 km (8,053 miles), with an estimated flight time of ~15h 45m.
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