| Rank | City | 1840 Population |
|---|---|---|
| 1 | Philadelphia | 93,665 |
| 2 | Northern Liberties district | 34,474 |
| 3 | Spring Garden district | 27,849 |
| 4 | Southwark district | 27,548 |
| 5 | Kensington district | 22,314 |
| 6 | Pittsburgh | 21,115 |
| 7 | Moyamensing township | 14,573 |
| 8 | Allegheny | 10,089 |
| 9 | Lancaster | 8,417 |
| 10 | Reading | 8,410 |
| 11 | Harrisburg | 5,980 |
| 12 | Easton | 4,865 |
| 13 | York | 4,779 |
| 14 | Carlisle | 4,351 |
| 15 | Pottsville | 4,345 |
In 1840, the largest city in Pennsylvania was Philadelphia, with a population of 93,665. The second largest city is Northern Liberties district, with a population of 34,474.
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