Hanoi
3,359 km²
Hong Kong
1,114 km²
Vietnam
China
Area Comparison
Hanoi is 3.0x larger than Hong Kong
Population Comparison
Hanoi has 1.1x more people than Hong Kong
Hanoi is significantly larger, covering 3.0 times the area of Hong Kong. Hanoi spans 3,359 km² (1,297 mi²) while Hong Kong covers 1,114 km² (430 mi²) — a difference of 2,245 km². You could fit Hong Kong inside Hanoi 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, Hong Kong at 1,114 km² is about 1.2x the size of Berlin.
In more relatable units, Hanoi's 3,359 km² is about 470,000 American football fields, 57 times the area of Manhattan, or 32 times the area of Paris. For Hong Kong, that's about 156,000 American football fields, 19 times the area of Manhattan, or 11 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.
Hong Kong is a special administrative region of China. Situated on China's southern coast just south of Shenzhen, it consists of Hong Kong Island, Kowloon, and the New Territories. With 7.5 million residents in a 1,114-square-kilometre (430 sq mi) territory, Hong Kong is the fourth-most densely populated region in the world.
Also known as "Pearl of the Orient", Hong Kong has an area of 1,114 km² and is home to 7.4 million people. It was established in 1841. Visitors come for Victoria Harbour, Victoria Peak, Star Ferry, and much more. Getting around is easy with the MTR Hong Kong.
Hong Kong squeezes 7.5 million residents into 1,114 km2, making it the world's fourth-most densely populated region.
Hanoi has a population density of 2,397 people per km² — a moderately dense city. Hong Kong, with 6,652 people per km², is a densely populated city. Hong Kong is noticeably denser, packing 2.8 times more people per square kilometer.
Both cities are in Asia, but they represent different national approaches to urban development. Hanoi (Vietnam) and Hong Kong (China) offer a fascinating regional contrast.
Both cities share a humid subtropical climate, though local geography creates distinct microclimates in each.
Size Ratio
Hong Kong fits inside Hanoi ~3 times
Density Gap
Hong Kong is 2.8x more densely populated
History
Hanoi is ~831 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).
Hong Kong covers 1,114 km². Cities with a similar urban footprint include Lagos (1,172 km²), San Antonio (1,209 km²), Rio de Janeiro (1,221 km²), Dallas (997 km²), or Abu Dhabi (972 km²).
The straight-line distance from Hanoi to Hong Kong is 873 km (542 miles), with an estimated flight time of ~1h 32m.
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