Oslo
454 km²
Rio de Janeiro
1,221 km²
Norway
Brazil
Area Comparison
Oslo is 2.7x smaller than Rio de Janeiro
Population Comparison
Oslo has 9.4x fewer people than Rio de Janeiro
Yes — Rio de Janeiro is 2.7x larger than Oslo by area. Rio de Janeiro spans 1,221 km² (471 mi²) while Oslo covers 454 km² (175 mi²) — a difference of 767 km². You could fit Oslo inside Rio de Janeiro approximately 2 times.
To put Oslo's size in perspective, its area of 454 km² is about 1.3x smaller than Seoul. Meanwhile, Rio de Janeiro at 1,221 km² is about 1.3x smaller than London.
Picture Oslo another way: its area is large enough to fit about 64,000 American football fields, 130 times the area of Central Park, or 8 times the area of Manhattan. Rio de Janeiro, by comparison, equals about 171,000 American football fields, 21 times the area of Manhattan, or 12 times the area of Paris.
Oslo is the capital and most populous city of Norway. It constitutes both a county and a municipality. The municipality of Oslo had a population of 724,290 in 2025, while the city's greater urban area had a population of 1,110,887 in 2025, and the metropolitan area had an estimated population of 1,546,706 in 2021.
Known as "Tigerstaden", Oslo covers 454 km² with a population of 0.7 million. The city was established in 1048. Oslo is known for Vigeland Park, Oslo Opera House, Akershus Fortress, among other attractions.
Oslo is both a county and a municipality, with the city itself home to about 724,000 residents in 2025.
Rio de Janeiro, also known simply as Rio, is the capital of the state of Rio de Janeiro. It is the second-most-populous city in Brazil after São Paulo and the sixth-most-populous city in the Americas.
Also known as "Cidade Maravilhosa", Rio de Janeiro has an area of 1,221 km² and is home to 6.8 million people. Its history stretches back to 1565. Visitors come for Christ the Redeemer, Sugarloaf Mountain, Copacabana beach, and much more. Getting around is easy with the MetrôRio.
Rio de Janeiro is the second-most-populous city in Brazil after São Paulo and the sixth-most-populous in the Americas.
Oslo has a population density of 1,586 people per km² — a relatively spread-out city. Rio de Janeiro, with 5,528 people per km², is a densely populated city. Rio de Janeiro is dramatically more crowded, with 3.5x the population density.
Size Ratio
Oslo fits inside Rio de Janeiro ~2 times
Density Gap
Rio de Janeiro is 3.5x more densely populated
History
Oslo is ~517 years older
Oslo covers 454 km². Cities with a similar urban footprint include Prague (496 km²), Vienna (415 km²), Montreal (498 km²), Denver (401 km²), or Warsaw (517 km²).
Rio de Janeiro covers 1,221 km². Cities with a similar urban footprint include San Antonio (1,209 km²), Lagos (1,172 km²), Rome (1,285 km²), Los Angeles (1,302 km²), or Hong Kong (1,114 km²).
The straight-line distance from Oslo to Rio de Janeiro is 10,421 km (6,475 miles), with an estimated flight time of ~12h 46m.
Want to explore more? Compare city sizes for any two cities worldwide, or share your location live with friends.