Phone numbers in Martinsburg, West Virginia
Martinsburg has 33 phone prefixes in area codes 304, 681.
Biggest holders: Frontier, AT&T Mobility, T-Mobile (including Sprint). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 55%
- Local phone company 24%
- Internet / business phone carrier 15%
- Phone company 6%
Every prefix in Martinsburg
Search the first six digits of a number in this list. If it's here, the number started in Martinsburg with the carrier shown. If it isn't, check the West Virginia page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 304-260 | Frontier | Local phone company | – |
| 304-261 | AT&T Mobility | Mobile carrier | – |
| 304-262 | Frontier | Local phone company | – |
| 304-263 | Frontier | Local phone company | – |
| 304-264 | Frontier | Local phone company | – |
| 304-267 | Frontier | Local phone company | – |
| 304-268 | AT&T Mobility | Mobile carrier | – |
| 304-350 | T-Mobile (including Sprint) | Mobile carrier | 2010 |
| 304-378 | Comcast | Internet / business phone carrier | – |
| 304-433 | Frontier | Local phone company | – |
| 304-579 | AT&T Mobility | Mobile carrier | – |
| 304-582 | UScellular | Mobile carrier | 2001 |
| 304-596 | AT&T Mobility | Mobile carrier | 2002 |
| 304-616 | T-Mobile (including Sprint) | Mobile carrier | 2004 |
| 304-620 | T-Mobile (including Sprint) | Mobile carrier | – |
| 304-671 | UScellular | Mobile carrier | – |
| 304-676 | UScellular | Mobile carrier | – |
| 304-702 | UScellular | Mobile carrier | – |
| 304-707 | MCImetro (Verizon Business) | Internet / business phone carrier | 2007 |
| 304-839 | AT&T Mobility | Mobile carrier | – |
| 304-901 | Citynet West Virginia | Phone company | 2007 |
| 681-247 | Shentel Communications | Local phone company | 2016 |
| 681-248 | Onvoy | Internet / business phone carrier | 2018 |
| 681-260 | Frontier | Local phone company | 2012 |
| 681-283 | T-Mobile (including Sprint) | Mobile carrier | 2019 |
| 681-389 | T-Mobile (including Sprint) | Mobile carrier | 2021 |
| 681-446 | Comcast | Internet / business phone carrier | 2022 |
| 681-513 | Onvoy | Internet / business phone carrier | 2023 |
| 681-534 | T-Mobile (including Sprint) | Mobile carrier | 2024 |
| 681-572 | AT&T Mobility | Mobile carrier | 2025 |
| 681-575 | Verizon Wireless | Mobile carrier | 2025 |
| 681-597 | AT&T Mobility | Mobile carrier | 2026 |
| 681-766 | Opentact | Phone company | 2026 |
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.