Copenhagen
91 km²
Philadelphia
370 km²
Denmark
United States
Area Comparison
Copenhagen is 4.1x smaller than Philadelphia
Population Comparison
Copenhagen has 2.4x fewer people than Philadelphia
In terms of area, Philadelphia is 4.1x the size of Copenhagen. Philadelphia spans 370 km² (143 mi²) while Copenhagen covers 91 km² (35 mi²) — a difference of 279 km². You could fit Copenhagen inside Philadelphia approximately 4 times.
To put Copenhagen's size in perspective, its area of 91 km² is about 1.2x smaller than Paris (city proper). Meanwhile, Philadelphia at 370 km² is about 1.6x smaller than Seoul.
Picture Copenhagen another way: its area is large enough to fit about 13,000 American football fields, 190 times the area of Vatican City, or 45 times the area of Monaco. Philadelphia, by comparison, equals about 52,000 American football fields, 180 times the area of Monaco, or 110 times the area of Central Park.
Copenhagen is the capital and most populous city of both the country of Denmark and the wider Kingdom of Denmark, with a population of 667,000 people in the municipality and 1.4 million in the urban area. The city is situated mainly on the island of Zealand (Sjælland), with a smaller part on the island of Amager. Copenhagen is separated from Malmö, Sweden, by the Øresund strait. The Øresund Bridge connects the two cities by rail and road.
Known as "City of Spires", Copenhagen covers 91 km² with a population of 0.7 million. The city was established in 1167. Copenhagen is known for The Little Mermaid statue, Tivoli Gardens, Nyhavn waterfront, among other attractions.
Copenhagen sits mainly on the island of Zealand, with a smaller portion on the island of Amager.
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.
Also known as "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.
Copenhagen has a population density of 7,363 people per km² — a densely populated city. Philadelphia, with 4,324 people per km², is a moderately dense city. Copenhagen is noticeably denser, packing 1.7 times more people per square kilometer.
Size Ratio
Copenhagen fits inside Philadelphia ~4 times
Density Gap
Copenhagen is 1.7x more densely populated
History
Copenhagen is ~515 years older
Copenhagen covers 91 km². Cities with a similar urban footprint include Zurich (88 km²), Lisbon (100 km²), Barcelona (101 km²), Paris (105 km²), or Vancouver (115 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 Copenhagen to Philadelphia is 6,317 km (3,925 miles), with an estimated flight time of ~7h 56m.
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