Phone numbers in North Royalton, Ohio
North Royalton has 11 phone prefixes in area code 440.
Biggest holders: AT&T (local phone), Level 3 (Lumen), MCImetro (Verizon Business). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 9%
- Local phone company 36%
- Internet / business phone carrier 55%
Every prefix in North Royalton
Search the first six digits of a number in this list. If it's here, the number started in North Royalton with the carrier shown. If it isn't, check the Ohio page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 440-230 | AT&T (local phone) | Local phone company | – |
| 440-237 | AT&T (local phone) | Local phone company | – |
| 440-372 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 440-390 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 440-457 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 440-582 | AT&T (local phone) | Local phone company | – |
| 440-628 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 440-652 | Teleport Communications America | Internet / business phone carrier | – |
| 440-794 | Onvoy | Internet / business phone carrier | – |
| 440-848 | MCImetro (Verizon Business) | Internet / business phone carrier | – |
| 440-877 | AT&T (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.