Phone numbers in Duncan, Oklahoma
Duncan has 15 phone prefixes in area code 580.
Biggest holders: AT&T (local phone), T-Mobile (including Sprint), UScellular. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 47%
- Local phone company 33%
- Internet / business phone carrier 20%
Every prefix in Duncan
Search the first six digits of a number in this list. If it's here, the number started in Duncan with the carrier shown. If it isn't, check the Oklahoma page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 580-251 | AT&T (local phone) | Local phone company | – |
| 580-252 | AT&T (local phone) | Local phone company | – |
| 580-255 | AT&T (local phone) | Local phone company | – |
| 580-467 | UScellular | Mobile carrier | – |
| 580-470 | AT&T (local phone) | Local phone company | – |
| 580-475 | AT&T (local phone) | Local phone company | – |
| 580-560 | Verizon Wireless | Mobile carrier | 2003 |
| 580-605 | AT&T Mobility | Mobile carrier | 2026 |
| 580-606 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 580-656 | UScellular | Mobile carrier | 2002 |
| 580-736 | T-Mobile (including Sprint) | Mobile carrier | 2002 |
| 580-786 | Level 3 (Lumen) | Internet / business phone carrier | 2002 |
| 580-860 | Telnyx | Internet / business phone carrier | 2017 |
| 580-943 | T-Mobile (including Sprint) | Mobile carrier | 2019 |
| 580-990 | TON80 Communications | Internet / business phone carrier | 2022 |
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.