Barcelona
101 km²
Hanoi
3,359 km²
Spain
Vietnam
Area Comparison
Barcelona is 33.3x smaller than Hanoi
Population Comparison
Barcelona has 4.8x fewer people than Hanoi
In terms of area, Hanoi is 33.3x the size of Barcelona. Hanoi spans 3,359 km² (1,297 mi²) while Barcelona covers 101 km² (39 mi²) — a difference of 3,258 km². You could fit Barcelona inside Hanoi approximately 33 times.
To put Barcelona's size in perspective, its area of 101 km² is roughly the same size as Paris (city proper). Meanwhile, Hanoi at 3,359 km² is about 1.2x smaller than Rhode Island.
Picture Barcelona another way: its area is large enough to fit about 14,000 American football fields, 50 times the area of Monaco, or 30 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.
Barcelona is a city on the northeastern coast of Spain. It is the capital and largest city of the autonomous community of Catalonia, as well as the second-most populous municipality of Spain. With a population of 1.7 million within city limits, its urban area extends to numerous neighbouring municipalities within the province of Barcelona and is home to around 5.7 million people, making it the fifth most populous urban area of the European Union after Paris, the Ruhr area, Madrid and Milan.
Known as "Ciutat Comtal", Barcelona covers 101 km² with a population of 1.7 million. The city was founded around 230 BC. Barcelona is known for Sagrada Familia, Park Güell, La Rambla, among other attractions. The city's main transit system is the Barcelona Metro (TMB).
Barcelona is the second-most populous municipality in Spain and the capital of the autonomous community of Catalonia.
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.
Also known as "City Between Rivers", Hanoi has an area of 3,359 km² and is home to 8.1 million people. It was established in 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 Hanoi metropolitan area covers 3,359 km², which is 4.2x larger than greater Barcelona at 803 km². The Hanoi metro area is also more populous, with 8.1 million people compared to 5.6 million.
Barcelona has a population density of 16,436 people per km² — an extremely dense urban environment. Hanoi, with 2,397 people per km², is a moderately dense city. Barcelona is dramatically more crowded, with 6.9x the population density.
This comparison spans continents — Barcelona in Europe versus Hanoi in Asia. Despite the geographic distance, comparing their sizes reveals surprising insights about how cities grow worldwide.
Barcelona has a Mediterranean climate while Hanoi experiences humid subtropical conditions. When it's noon in Hanoi, it's 6:00 AM in Barcelona — a 6-hour time difference.
Size Ratio
Barcelona fits inside Hanoi ~33 times
Density Gap
Barcelona is 6.9x more densely populated
Time Difference
6 hours apart
History
Barcelona is ~1,240 years older
Barcelona covers 101 km². Cities with a similar urban footprint include Lisbon (100 km²), Paris (105 km²), Copenhagen (91 km²), Vancouver (115 km²), or Zurich (88 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 Barcelona to Hanoi is 9,550 km (5,934 miles), with an estimated flight time of ~11h 44m.
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