Denver
401 km²
Philadelphia
370 km²
United States
United States
Area Comparison
Denver is 1.1x larger than Philadelphia
Population Comparison
Denver has 2.2x fewer people than Philadelphia
In terms of area, Denver is 1.1x the size of Philadelphia. Denver spans 401 km² (155 mi²) while Philadelphia covers 370 km² (143 mi²) — a difference of 31 km².
To put Denver's size in perspective, its area of 401 km² is about 1.5x smaller than Seoul. Meanwhile, Philadelphia at 370 km² is about 1.6x smaller than Seoul.
Picture Denver another way: its area is large enough to fit about 56,000 American football fields, 200 times the area of Monaco, or 120 times the area of Central Park. Philadelphia works out to about 52,000 American football fields, 180 times the area of Monaco, or 110 times the area of Central Park.
Denver is the capital and most populous city of the U.S. state of Colorado. Officially a consolidated city and county, it is located in the South Platte River valley on the western edge of the High Plains, and is just east of the Front Range of the Rocky Mountains (Rockies). Denver is the 19th-most populous city in the United States and the fifth-most populous state capital, with a population of 715,522 at the 2020 census.
Known as "Mile High City", Denver covers 401 km² with a population of 0.7 million. The city was established in 1858. Denver is known for Red Rocks Amphitheatre, Denver Art Museum, Union Station, among other attractions.
Denver sits in the South Platte River valley just east of the Rocky Mountains' Front Range.
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.
Nicknamed "Philly", Philadelphia has an area of 370 km² and is home to 1.6 million people. It was established in 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.
Denver has a population density of 1,796 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 2.4 times more people per square kilometer.
Density Gap
Philadelphia is 2.4x more densely populated
History
Philadelphia is ~176 years older
Denver covers 401 km². Cities with a similar urban footprint include Vienna (415 km²), Portland (376 km²), Philadelphia (370 km²), Seattle (369 km²), or Dhaka (368 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 Denver to Philadelphia is 2,534 km (1,575 miles), with an estimated flight time of ~3h 29m.
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