Oslo
454 km²
Philadelphia
370 km²
Norway
United States
Area Comparison
Oslo is 1.2x larger than Philadelphia
Population Comparison
Oslo has 2.2x fewer people than Philadelphia
Oslo is significantly larger, covering 1.2 times the area of Philadelphia. Oslo spans 454 km² (175 mi²) while Philadelphia covers 370 km² (143 mi²) — a difference of 84 km².
To put Oslo's size in perspective, its area of 454 km² is about 1.3x smaller than Seoul. Meanwhile, Philadelphia at 370 km² is about 1.6x smaller than Seoul.
Oslo's footprint is roughly about 64,000 American football fields, 130 times the area of Central Park, or 8 times the area of Manhattan — pick whichever unit feels intuitive. For Philadelphia, that's about 52,000 American football fields, 180 times the area of Monaco, or 110 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.
Philadelphia, colloquially referred to as Philly, is the most populous city in the U.S. state of Pennsylvania, and the sixth-most populous city in the United States, with a Census-estimated population of 1,574,281 in July 2025. The Philadelphia metropolitan area has 6.33 million residents and is the nation's ninth-largest metropolitan area. Philadelphia is known for its culture, cuisine, and history, maintaining contemporary influence in business and technology, sports, and music.
Often called "Philly", Philadelphia has an area of 370 km² and is home to 1.6 million people. The city dates back to 1682. Visitors come for Liberty Bell, Independence Hall, Philly Cheesesteak, and much more.
Philadelphia is the sixth-most populous US city, with an estimated 1,574,281 residents as of July 2025.
Oslo has a population density of 1,586 people per km² — a relatively spread-out city. Philadelphia, with 4,324 people per km², is a moderately dense city. Philadelphia is noticeably denser, packing 2.7 times more people per square kilometer.
Density Gap
Philadelphia is 2.7x more densely populated
History
Oslo is ~634 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).
Philadelphia covers 370 km². Cities with a similar urban footprint include Seattle (369 km²), Dhaka (368 km²), Portland (376 km²), Atlanta (348 km²), or Denver (401 km²).
The straight-line distance from Oslo to Philadelphia is 6,041 km (3,754 miles), with an estimated flight time of ~7h 36m.
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