Identifiers: city · CDP · borough
| Rank | Community | Population |
|---|---|---|
| 1 | Warren (city), PA | 9,404 |
| 2 | North Warren (CDP), PA | 1,855 |
| 3 | Youngsville (borough), PA | 1,726 |
| 4 | Russell (CDP), PA | 1,292 |
| 5 | Sheffield (CDP), PA | 1,011 |
| 6 | Sugar Grove (borough), PA | 564 |
| 7 | Starbrick (CDP), PA | 462 |
| 8 | Clarendon (borough), PA | 410 |