Oslo
454 km²
Portland
376 km²
Norway
United States
Area Comparison
Oslo is 1.2x larger than Portland
Population Comparison
Oslo has 1.1x more people than Portland
Yes — Oslo is 1.2x larger than Portland by area. Oslo spans 454 km² (175 mi²) while Portland covers 376 km² (145 mi²) — a difference of 78 km².
To put Oslo's size in perspective, its area of 454 km² is about 1.3x smaller than Seoul. Meanwhile, Portland at 376 km² is about 1.6x smaller than Seoul.
In more relatable units, Oslo's 454 km² is about 64,000 American football fields, 130 times the area of Central Park, or 8 times the area of Manhattan. Portland works out to about 53,000 American football fields, 190 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.
Portland is the most populous city in the U.S. state of Oregon. Located in the Pacific Northwest at the confluence of the Willamette and Columbia rivers, it is the 28th-most populous city in the United States, sixth-most populous on the West Coast, and fourth-most populous in the Pacific Northwest, with a population of 652,503 at the 2020 census. The Portland metropolitan area, with over 2.54 million residents, is the 26th-largest metropolitan area in the nation.
Often called "Rose City", Portland has an area of 376 km² and is home to 0.7 million people. Visitors come for Powell's City of Books, Voodoo Doughnut, Washington Park, and much more.
Portland sits at the confluence of the Willamette and Columbia rivers in the Pacific Northwest.
Oslo has a population density of 1,586 people per km² — a relatively spread-out city. Portland, with 1,729 people per km², is a relatively spread-out city. Both cities have comparable density, though Portland is slightly more compact.
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).
Portland covers 376 km². Cities with a similar urban footprint include Philadelphia (370 km²), Seattle (369 km²), Dhaka (368 km²), Denver (401 km²), or Atlanta (348 km²).
The straight-line distance from Oslo to Portland is 7,552 km (4,693 miles), with an estimated flight time of ~9h 23m.
Want to explore more? Compare city sizes for any two cities worldwide, or share your location live with friends.