| Rank | City | 1870 Population | Growth Rate (Annual) |
|---|---|---|---|
| 1 | Philadelphia | 674,022 | 1.8% |
| 2 | Pittsburgh | 86,076 | 5.7% |
| 3 | Allegheny | 53,180 | 6.4% |
| 4 | Scranton | 35,092 | – |
| 5 | Reading | 33,930 | 3.9% |
| 6 | Harrisburg | 23,104 | 5.6% |
| 7 | Lancaster | 20,233 | 1.4% |
| 8 | Erie | 19,646 | – |
| 9 | Williamsport | 16,030 | – |
In 1870, the largest city in Pennsylvania was Philadelphia, with a population of 674,022. The second largest city is Pittsburgh, with a population of 86,076.
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