Area code 878: where it is and who calls from it
Area code 878 is in Pennsylvania.
Pennsylvania (Pittsburgh) and suburbs
| Where | Pennsylvania |
|---|---|
| Time zone | Eastern Time ยท local time |
| In service since | 2001 |
| Overlay | Yes, with 412, 878, 724 |
| Prefixes assigned | 191 of 792 possible (24%) |
Overlay: 878 covers the same area as 412. Overlay areas use 10-digit dialing, so a seven-digit number alone won't connect, and neighbors can have different area codes.
Where 878 numbers started
Every prefix is assigned to a rate center, the local calling area it was set up in. These are the biggest in 878, with how many prefixes each has.
Plus 34 smaller rate centers.
Who holds 878 numbers
- Mobile carrier 18%
- Local phone company 5%
- Internet / business phone carrier 74%
- Phone company 4%
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| Onvoy | Internet / business phone carrier | 65 | 34% |
| TON80 Communications | Internet / business phone carrier | 19 | 10% |
| T-Mobile (including Sprint) | Mobile carrier | 14 | 7% |
| Fractel | Internet / business phone carrier | 11 | 6% |
| Comcast | Internet / business phone carrier | 7 | 4% |
| MCImetro (Verizon Business) | Internet / business phone carrier | 7 | 4% |
| Verizon Wireless | Mobile carrier | 7 | 4% |
| Commio | Internet / business phone carrier | 7 | 4% |
| Bandwidth | Internet / business phone carrier | 6 | 3% |
| AT&T Mobility | Mobile carrier | 6 | 3% |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number.
States served: Pennsylvania.
Other area codes in Pennsylvania
215 223 267 272 412 445 484 570 582 610 717 724 814 835
Got a call from 878?
An area code tells you where a number was first assigned, not where the caller is. People keep their numbers when they move, and scammers can fake any number. If you weren't expecting the call, let it go to voicemail.
If the call shows a 878 number that matches the first six digits of your own, that's often neighbor spoofing. Use the box above to check the full number.
Area code facts from the NANPA area code database (updated 10/06/2026); prefixes and carriers from NANPA's central office code records (updated 2026-10-10). Place description adapted from Wikipedia, CC BY-SA 4.0.