Denver
401 km²
Hanoi
3,359 km²
United States
Vietnam
Area Comparison
Denver is 8.4x smaller than Hanoi
Population Comparison
Denver has 11.2x fewer people than Hanoi
In terms of area, Hanoi is 8.4x the size of Denver. Hanoi spans 3,359 km² (1,297 mi²) while Denver covers 401 km² (155 mi²) — a difference of 2,958 km². You could fit Denver inside Hanoi approximately 8 times.
To put Denver's size in perspective, its area of 401 km² is about 1.5x smaller than Seoul. Meanwhile, Hanoi at 3,359 km² is about 1.2x smaller than Rhode Island.
Picture Denver another way: its area is large enough to fit about 56,000 American football fields, 200 times the area of Monaco, or 120 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.
Denver is the capital and most populous city of the U.S. state of Colorado. Officially a consolidated city and county, it is located in the South Platte River valley on the western edge of the High Plains, and is just east of the Front Range of the Rocky Mountains (Rockies). Denver is the 19th-most populous city in the United States and the fifth-most populous state capital, with a population of 715,522 at the 2020 census.
Known as "Mile High City", Denver covers 401 km² with a population of 0.7 million. The city was established in 1858. Denver is known for Red Rocks Amphitheatre, Denver Art Museum, Union Station, among other attractions.
Denver sits in the South Platte River valley just east of the Rocky Mountains' Front Range.
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. 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.
Denver has a population density of 1,796 people per km² — a relatively spread-out city. Hanoi, with 2,397 people per km², is a moderately dense city. Both cities have comparable density, though Hanoi is slightly more compact.
Denver has a cold semi-arid climate climate while Hanoi experiences humid subtropical conditions.
Size Ratio
Denver fits inside Hanoi ~8 times
Density Gap
Hanoi is 1.3x more densely populated
History
Hanoi is ~848 years older
Denver covers 401 km². Cities with a similar urban footprint include Vienna (415 km²), Portland (376 km²), Philadelphia (370 km²), Seattle (369 km²), or Dhaka (368 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 Denver to Hanoi is 12,539 km (7,791 miles), with an estimated flight time of ~15h 15m.
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