| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Philadelphia | 1 | 1,567,280 | 1,600,737 | -0.44% | 11,668 | 134 | City |
Philadelphia is the largest city in Philadelphia County, with a population of 1,567,280.
Philadelphia is the smallest city in Philadelphia County, with a population of 1,567,280.
There is 1 city in Philadelphia County, Pennsylvania.