Phone numbers in Dauphin, Pennsylvania
Dauphin has 5 phone prefixes in area codes 223, 717.
Biggest holders: Onvoy, MCImetro (Verizon Business), Windstream D & E Systems. This is the local calling area (rate center) where those prefixes were first assigned.
- Local phone company 40%
- Internet / business phone carrier 60%
Every prefix in Dauphin
Search the first six digits of a number in this list. If it's here, the number started in Dauphin with the carrier shown. If it isn't, check the Pennsylvania page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 223-344 | Onvoy | Internet / business phone carrier | 2021 |
| 717-474 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 717-559 | Windstream D & E Systems | Local phone company | 2008 |
| 717-674 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 717-921 | Verizon (local phone) | Local phone company | – |
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.