Pennsylvania 지역 코드: 878
Note：878 지역 번호는 다음과 같습니다 Pennsylvania, 미국. 국제 전화 번호는 001878 or 001-878、0010878、+1-878、+1+878、+1878、00-1-878、00 1 878.
More About Area Code 878
Area Code 878 was first put in service August 17, 2001. Currently, the largest city it serves is Pittsburgh, PA, and it overlaps coverage areas with area codes 412 and 724.
Active Phone Number Prefixes
| Prefix | Usage | Primary City | Carrier |
| (878) 201- | Landline | Rochester | Peerless Network Of Pennsylvania |
| (878) 202- | Landline | Sharon | Time Warner Cable Information Svcs (pa), Pa |
| (878) 222- | Landline | New Wilmington | Voxbeam Telecommunications Inc. |
| (878) 258- | Landline | Freeport | Salsgiver Telecom |
| (878) 295- | Wireless | Greensburg | Aerial Communications |
| (878) 302- | Landline | Pittsburgh | Peerless Network Of Pennsylvania |
| (878) 332- | Landline | Wexford | Level 3 Communications |
| (878) 422- | Landline | Freeport | Salsgiver Telecom |
| (878) 444- | Landline | Homer City | Voxbeam Telecommunications Inc. |
| (878) 777- | Landline | Derry | Voxbeam Telecommunications Inc. |
| (878) 888- | Landline | Aultman | Voxbeam Telecommunications Inc. |