Phone numbers in Delaware, Ohio
Delaware has 20 phone prefixes in area codes 220, 740.
Biggest holders: T-Mobile (including Sprint), Frontier, Level 3 (Lumen). This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 50%
- Local phone company 25%
- Internet / business phone carrier 25%
Every prefix in Delaware
Search the first six digits of a number in this list. If it's here, the number started in Delaware with the carrier shown. If it isn't, check the Ohio page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 220-244 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 740-203 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 740-272 | T-Mobile (including Sprint) | Mobile carrier | – |
| 740-362 | Frontier | Local phone company | – |
| 740-363 | Frontier | Local phone company | – |
| 740-368 | Frontier | Local phone company | – |
| 740-369 | Frontier | Local phone company | – |
| 740-417 | AT&T Mobility | Mobile carrier | – |
| 740-513 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 740-602 | AT&T Mobility | Mobile carrier | – |
| 740-803 | T-Mobile (including Sprint) | Mobile carrier | – |
| 740-815 | Verizon Wireless | Mobile carrier | – |
| 740-816 | Verizon Wireless | Mobile carrier | – |
| 740-833 | Frontier | Local phone company | – |
| 740-834 | Level 3 (Lumen) | Internet / business phone carrier | 2001 |
| 740-904 | Verizon Wireless | Mobile carrier | 2023 |
| 740-957 | Level 3 (Lumen) | Internet / business phone carrier | – |
| 740-971 | T-Mobile (including Sprint) | Mobile carrier | – |
| 740-972 | T-Mobile (including Sprint) | Mobile carrier | – |
| 740-990 | MCImetro (Verizon Business) | Internet / business phone carrier | 2004 |
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.