Copenhagen
91 km²
Hanoi
3,359 km²
Denmark
Vietnam
Area Comparison
Copenhagen is 36.9x smaller than Hanoi
Population Comparison
Copenhagen has 12.0x fewer people than Hanoi
Hanoi is significantly larger, covering 36.9 times the area of Copenhagen. Hanoi spans 3,359 km² (1,297 mi²) while Copenhagen covers 91 km² (35 mi²) — a difference of 3,268 km². You could fit Copenhagen inside Hanoi approximately 36 times.
To put Copenhagen's size in perspective, its area of 91 km² is about 1.2x smaller than Paris (city proper). Meanwhile, Hanoi at 3,359 km² is about 1.2x smaller than Rhode Island.
Picture Copenhagen another way: its area is large enough to fit about 13,000 American football fields, 190 times the area of Vatican City, or 45 times the area of Monaco. Hanoi works out to about 470,000 American football fields, 57 times the area of Manhattan, or 32 times the area of Paris.
Copenhagen is the capital and most populous city of both the country of Denmark and the wider Kingdom of Denmark, with a population of 667,000 people in the municipality and 1.4 million in the urban area. The city is situated mainly on the island of Zealand (Sjælland), with a smaller part on the island of Amager. Copenhagen is separated from Malmö, Sweden, by the Øresund strait. The Øresund Bridge connects the two cities by rail and road.
Known as "City of Spires", Copenhagen covers 91 km² with a population of 0.7 million. The city was established in 1167. Copenhagen is known for The Little Mermaid statue, Tivoli Gardens, Nyhavn waterfront, among other attractions.
Copenhagen sits mainly on the island of Zealand, with a smaller portion on the island of Amager.
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.
Copenhagen has a population density of 7,363 people per km² — a densely populated city. Hanoi, with 2,397 people per km², is a moderately dense city. Copenhagen is dramatically more crowded, with 3.1x the population density.
Size Ratio
Copenhagen fits inside Hanoi ~36 times
Density Gap
Copenhagen is 3.1x more densely populated
History
Hanoi is ~157 years older
Copenhagen covers 91 km². Cities with a similar urban footprint include Zurich (88 km²), Lisbon (100 km²), Barcelona (101 km²), Paris (105 km²), or Vancouver (115 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 Copenhagen to Hanoi is 8,290 km (5,151 miles), with an estimated flight time of ~10h 15m.
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