1 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Philadelphia | 1 | 1,517,114 | 1,600,684 | -1.09% | 11,292 | 134.36 | City |
Philadelphia is the largest city in Philadelphia County, with a population of 1,517,114.
Philadelphia is the smallest city in Philadelphia County.
There is 1 city in Philadelphia County, Pennsylvania.