Phone numbers in Douglas, Arizona
Douglas has 9 phone prefixes in area code 520.
Biggest holders: CenturyLink / Lumen, Onvoy, IP Horizon. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 22%
- Local phone company 33%
- Internet / business phone carrier 44%
Every prefix in Douglas
Search the first six digits of a number in this list. If it's here, the number started in Douglas with the carrier shown. If it isn't, check the Arizona page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 520-364 | CenturyLink / Lumen | Local phone company | – |
| 520-368 | CenturyLink / Lumen | Local phone company | 2007 |
| 520-379 | Onvoy | Internet / business phone carrier | – |
| 520-536 | Onvoy | Internet / business phone carrier | 2020 |
| 520-564 | IP Horizon | Internet / business phone carrier | 2021 |
| 520-645 | Verizon Wireless | Mobile carrier | 2013 |
| 520-702 | Onvoy | Internet / business phone carrier | 2022 |
| 520-727 | AT&T Mobility | Mobile carrier | 2005 |
| 520-805 | CenturyLink / Lumen | 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.