| | | 4213728 | Clappertown CDP | Pennsylvania | Blair County | Altoona, PA 11020 | Altoona-Huntingdon, PA 107 | N |
| | | 4213992 | Claysburg CDP | Pennsylvania | Blair County | Altoona, PA 11020 | Altoona-Huntingdon, PA 107 | N |
| | | 4216432 | Cotton Town CDP | Pennsylvania | Blair County | Altoona, PA 11020 | Altoona-Huntingdon, PA 107 | N |
| | | 4216590 | Cove Forge CDP | Pennsylvania | Blair County | Altoona, PA 11020 | Altoona-Huntingdon, PA 107 | N |
| | | 4217368 | Cross Keys CDP | Pennsylvania | Blair County | Altoona, PA 11020 | Altoona-Huntingdon, PA 107 | N |
| | | 4217624 | Culp CDP | Pennsylvania | Blair County | Altoona, PA 11020 | Altoona-Huntingdon, PA 107 | N |
| | | 4217784 | Curryville CDP | Pennsylvania | Blair County | Altoona, PA 11020 | Altoona-Huntingdon, PA 107 | N |
| | | 4220214 | Dumb Hundred CDP | Pennsylvania | Blair County | Altoona, PA 11020 | Altoona-Huntingdon, PA 107 | N |
| | | 4220248 | Duncansville borough | Pennsylvania | Blair County | Altoona, PA 11020 | Altoona-Huntingdon, PA 107 | N |
| | | 4220752 | East Altoona CDP | Pennsylvania | Blair County | Altoona, PA 11020 | Altoona-Huntingdon, PA 107 | N |