Phone numbers in Clairton, Pennsylvania
Clairton has 9 phone prefixes in area codes 412, 878.
Biggest holders: Onvoy, Bandwidth, Teleport Communications America. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 11%
- Internet / business phone carrier 78%
- Phone company 11%
Every prefix in Clairton
Search the first six digits of a number in this list. If it's here, the number started in Clairton with the carrier shown. If it isn't, check the Pennsylvania page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 412-226 | Teleport Communications America | Internet / business phone carrier | – |
| 412-233 | Verizon (local phone) | Local phone company | – |
| 412-274 | Onvoy | Internet / business phone carrier | 2016 |
| 412-468 | Ymax Communications | Phone company | 2006 |
| 412-533 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 412-547 | Bandwidth | Internet / business phone carrier | 2019 |
| 412-743 | Onvoy | Internet / business phone carrier | 2019 |
| 412-945 | Bandwidth | Internet / business phone carrier | – |
| 878-433 | TON80 Communications | Internet / business phone carrier | 2022 |
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. Source: NANPA central office code records, 2026-10-10.