Phone numbers in Willcox, Arizona
Willcox has 18 phone prefixes in area code 520.
Biggest holders: Verizon Wireless, Level 3 (Lumen), CenturyLink / Lumen. This is the local calling area (rate center) where those prefixes were first assigned.
- Mobile carrier 50%
- Local phone company 11%
- Internet / business phone carrier 33%
- Phone company 6%
Every prefix in Willcox
Search the first six digits of a number in this list. If it's here, the number started in Willcox with the carrier shown. If it isn't, check the Arizona page or look the number up.
| Prefix | Carrier | Type | Assigned |
|---|---|---|---|
| 520-242 | Verizon Wireless | Mobile carrier | 2021 |
| 520-253 | Verizon Wireless | Mobile carrier | 2003 |
| 520-254 | Level 3 (Lumen) | Internet / business phone carrier | 2004 |
| 520-337 | Level 3 (Lumen) | Internet / business phone carrier | 2008 |
| 520-348 | CenturyLink / Lumen | Local phone company | 2015 |
| 520-384 | CenturyLink / Lumen | Local phone company | – |
| 520-435 | T-Mobile (including Sprint) | Mobile carrier | 2023 |
| 520-503 | Onvoy | Internet / business phone carrier | 2020 |
| 520-507 | Verizon Wireless | Mobile carrier | – |
| 520-541 | Verizon Wireless | Mobile carrier | 2021 |
| 520-630 | Onvoy | Internet / business phone carrier | 2021 |
| 520-643 | Verizon Wireless | Mobile carrier | 2022 |
| 520-656 | Verizon Wireless | Mobile carrier | 2022 |
| 520-676 | Verizon Wireless | Mobile carrier | 2025 |
| 520-698 | Verizon Wireless | Mobile carrier | 2023 |
| 520-766 | Valley Connections | Phone company | 2005 |
| 520-779 | Bandwidth | Internet / business phone carrier | 2018 |
| 520-929 | 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.