Philadelphia
370 km²
Xi'an
10,097 km²
United States
People's Republic of China
Area Comparison
Philadelphia is 27.3x smaller than Xi'an
Population Comparison
Philadelphia has 8.1x fewer people than Xi'an
Yes — Xi'an is 27.3x larger than Philadelphia by area. Xi'an spans 10,097 km² (3,898 mi²) while Philadelphia covers 370 km² (143 mi²) — a difference of 9,727 km². You could fit Philadelphia inside Xi'an approximately 27 times.
To put Philadelphia's size in perspective, its area of 370 km² is about 1.6x smaller than Seoul. Meanwhile, Xi'an at 10,097 km² is about 1.6x the size of Shanghai.
In more relatable units, Philadelphia's 370 km² is about 52,000 American football fields, 180 times the area of Monaco, or 110 times the area of Central Park. Xi'an works out to about 1,400,000 American football fields, 170 times the area of Manhattan, or 96 times the area of Paris.
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.
Known as "Philly", Philadelphia covers 370 km² with a population of 1.6 million. The city was established in 1682. Philadelphia is known for Liberty Bell, Independence Hall, Philly Cheesesteak, among other attractions.
Philadelphia is the sixth-most populous US city, with an estimated 1,574,281 residents as of July 2025.
Xi'an is the capital of the Chinese province of Shaanxi. A sub-provincial city on the Guanzhong plain, the city is the third-most populous city in Western China after Chongqing and Chengdu, as well as the most populous city in Northwestern China. Its total population was 12.95 million in the 2020 census, including an urban population of 9.28 million.
Also known as "Ancient Capital", Xi'an has an area of 10,097 km² and is home to 12.9 million people. Visitors come for Terracotta Army, Xi'an City Wall, Big Wild Goose Pagoda, and much more.
Xi'an's 2020 census recorded 12.95 million residents, making it the most populous city in Northwestern China.
Philadelphia has a population density of 4,324 people per km² — a moderately dense city. Xi'an, with 1,283 people per km², is a relatively spread-out city. Philadelphia is dramatically more crowded, with 3.4x the population density.
Size Ratio
Philadelphia fits inside Xi'an ~27 times
Density Gap
Philadelphia is 3.4x more densely populated
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).
Xi'an covers 10,097 km². Cities with a similar urban footprint include Melbourne (9,993 km²), Wuhan (8,569 km²), Sydney (12,368 km²), Guangzhou (7,434 km²), or Chengdu (14,378 km²).
The straight-line distance from Philadelphia to Xi'an is 11,752 km (7,302 miles), with an estimated flight time of ~14h 20m.
Want to explore more? Compare city sizes for any two cities worldwide, or share your location live with friends.