| Rank | City | 1970 Population | Growth Rate (Annual) |
|---|---|---|---|
| 1 | Philadelphia | 1,948,609 | -0.3% |
| 2 | Pittsburgh | 520,117 | -1.5% |
In 1970, the largest city in Pennsylvania was Philadelphia, with a population of 1,948,609. The second largest city is Pittsburgh, with a population of 520,117.
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