| Rank | City | 1920 Population | Growth Rate (Annual) |
|---|---|---|---|
| 1 | Philadelphia | 1,823,779 | 1.6% |
| 2 | Pittsburgh | 588,343 | 1.0% |
| 3 | Scranton | 137,783 | 0.6% |
| 4 | Reading | 107,784 | 1.2% |
| 5 | Erie | 93,372 | 3.4% |
| 6 | Harrisburg | 75,917 | 1.7% |
| 7 | Wilkes-Barre | 73,833 | 1.0% |
| 8 | Allentown | 73,502 | – |
In 1920, the largest city in Pennsylvania was Philadelphia, with a population of 1,823,779. The second largest city is Pittsburgh, with a population of 588,343.
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