Oslo
454 km²
San Francisco
121 km²
Norway
USA
Area Comparison
Oslo is 3.8x larger than San Francisco
Population Comparison
Oslo has 1.2x fewer people than San Francisco
Yes — Oslo is 3.8x larger than San Francisco by area. Oslo spans 454 km² (175 mi²) while San Francisco covers 121 km² (47 mi²) — a difference of 333 km². You could fit San Francisco inside Oslo approximately 3 times.
To put Oslo's size in perspective, its area of 454 km² is about 1.3x smaller than Seoul. Meanwhile, San Francisco at 121 km² is about 1.2x the size of Paris (city proper).
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. San Francisco works out to about 17,000 American football fields, 60 times the area of Monaco, or 35 times the area of Central Park.
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.
San Francisco, officially the City and County of San Francisco, is the fourth-most populous city in California and the 17th-most populous in the United States, with a population of 826,079 in 2025. Among U.S. cities with a population of 300,000 or more, San Francisco is ranked first by per capita income, second by population density, and sixth by aggregate income as of 2023.
Also known as "The City by the Bay", San Francisco has an area of 121 km² and is home to 0.9 million people. The city dates back to 1776. Visitors come for Golden Gate Bridge, Alcatraz Island, Cable cars, and much more. Getting around is easy with the BART & Muni.
San Francisco ranks first by per capita income among all US cities with 300,000+ residents as of 2023.
Oslo has a population density of 1,586 people per km² — a relatively spread-out city. San Francisco, with 7,190 people per km², is a densely populated city. San Francisco is dramatically more crowded, with 4.5x the population density.
Size Ratio
San Francisco fits inside Oslo ~3 times
Density Gap
San Francisco is 4.5x more densely populated
History
Oslo is ~728 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).
San Francisco covers 121 km². Cities with a similar urban footprint include Vancouver (115 km²), Paris (105 km²), Miami (143 km²), Barcelona (101 km²), or Lisbon (100 km²).
The straight-line distance from Oslo to San Francisco is 8,338 km (5,181 miles), with an estimated flight time of ~10h 19m.
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