Phone numbers in Portsmouth, Ohio
Portsmouth has 31 phone prefixes in area codes 220, 740.
Biggest holders: Frontier, Verizon Wireless, AT&T Mobility. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 32%
- Local phone company 42%
- Internet / business phone carrier 16%
- Phone company 10%
Every prefix in Portsmouth
Search the first six digits of a number in this list. If it's here, the number started in Portsmouth with the carrier shown. If it isn't, check the Ohio page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 220-287 | Charter / Spectrum | Internet / business phone carrier | 2025 |
| 220-292 | Onvoy | Internet / business phone carrier | 2026 |
| 220-710 | Onvoy | Internet / business phone carrier | 2019 |
| 740-230 | Ram Technologies | Phone company | – |
| 740-250 | T-Mobile (including Sprint) | Mobile carrier | – |
| 740-259 | Frontier | Local phone company | – |
| 740-285 | Verizon Wireless | Mobile carrier | – |
| 740-351 | Frontier | Local phone company | – |
| 740-352 | AT&T Mobility | Mobile carrier | – |
| 740-353 | Frontier | Local phone company | – |
| 740-354 | Frontier | Local phone company | – |
| 740-355 | Frontier | Local phone company | – |
| 740-356 | Frontier | Local phone company | – |
| 740-357 | AT&T Mobility | Mobile carrier | – |
| 740-370 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 740-372 | Frontier | Local phone company | – |
| 740-456 | Frontier | Local phone company | – |
| 740-464 | AT&T Mobility | Mobile carrier | 2002 |
| 740-529 | Charter / Spectrum | Internet / business phone carrier | 2008 |
| 740-574 | Frontier | Local phone company | – |
| 740-716 | Horizon Services | Phone company | 2012 |
| 740-727 | AT&T Mobility | Mobile carrier | 2006 |
| 740-776 | Frontier | Local phone company | – |
| 740-778 | Frontier | Local phone company | – |
| 740-821 | T-Mobile (including Sprint) | Mobile carrier | – |
| 740-858 | Frontier | Local phone company | – |
| 740-876 | Tier 2 Communications | Phone company | 2006 |
| 740-935 | Verizon Wireless | Mobile carrier | – |
| 740-961 | Verizon Wireless | Mobile carrier | 2008 |
| 740-981 | Verizon Wireless | Mobile carrier | – |
| 740-991 | Frontier | 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.