| | 4200276 | Acosta CDP | Somerset County | PA | Somerset, PA 43740 | Johnstown-Somerset, PA 306 | N |
| | 4200396 | Addison borough | Somerset County | PA | Somerset, PA 43740 | Johnstown-Somerset, PA 306 | N |
| | 4205648 | Benson borough | Somerset County | PA | Somerset, PA 43740 | Johnstown-Somerset, PA 306 | N |
| | 4205776 | Berlin borough | Somerset County | PA | Somerset, PA 43740 | Johnstown-Somerset, PA 306 | N |
| | 4207712 | Boswell borough | Somerset County | PA | Somerset, PA 43740 | Johnstown-Somerset, PA 306 | N |
| | 4210720 | Cairnbrook CDP | Somerset County | PA | Somerset, PA 43740 | Johnstown-Somerset, PA 306 | N |
| | 4210808 | Callimont borough | Somerset County | PA | Somerset, PA 43740 | Johnstown-Somerset, PA 306 | N |
| | 4211624 | Casselman borough | Somerset County | PA | Somerset, PA 43740 | Johnstown-Somerset, PA 306 | N |
| | 4212296 | Central City borough | Somerset County | PA | Somerset, PA 43740 | Johnstown-Somerset, PA 306 | N |
| | 4215680 | Confluence borough | Somerset County | PA | Somerset, PA 43740 | Johnstown-Somerset, PA 306 | N |